A full color, reflective display having superior saturation and brightness is achieved with a novel display element comprising multichromatic elements. In one embodiment a capsule includes more than three species of particles which differ visually. One embodiment of the display employs three sub-pixels, each sub-pixel comprising a capsule including three species of particles which differ visually. Another embodiment of the display employs color filters to provide different visual states to the user. The display element presents a visual display in response to the application of an electrical signal to at least one of the capsules.

Patent
   8466852
Priority
Apr 10 1998
Filed
Apr 20 2004
Issued
Jun 18 2013
Expiry
Aug 06 2024
Extension
1946 days
Assg.orig
Entity
Large
139
681
EXPIRED
1. An encapsulated electrophoretic display comprising:
a full-color pixel comprising a first addressable sub-pixel and a second sub-pixel independently addressable from the first sub-pixel, wherein the first sub-pixel comprises a first electrophoretic medium comprising first particles in a suspending fluid and the second sub-pixel comprises a second electrophoretic medium comprising second particles in a suspending fluid, at least some of the second particles having a color different from the color of the first particles, each of the first and second sub-pixels being capable of displaying three colors selected from the group consisting of white, black, red, green, blue, cyan, magenta and yellow when addressed, the first sub-pixel being capable of displaying at least one color different from the colors capable of being displayed by the second sub-pixel.
2. The display of claim 1 further comprising a first color filter extending across the first sub-pixel and a second color filter extending across the second sub-pixel.
3. The display of claim 1 wherein the displaying of one color results from lateral migration of at least one of the electrophoretic particles.
4. The display of claim 1 wherein the suspending fluid of each of the first and second electrophoretic media is colored.
5. The display of claim 1 wherein the suspending fluid of each of the first and second electrophoretic media is clear.
6. The display of claim 1 further comprising a third sub-pixel comprising electrophoretic particles, the third sub-pixel being addressable independently of the first sub-pixel and the second sub-pixel, wherein the third sub-pixel comprises a third electrophoretic medium comprising third particles in a suspending fluid, at least some of the third particles having a color different from the colors of the first and second particles, the third sub-pixel being capable of displaying three colors selected from the group consisting of white, black, red, green, blue, cyan, magenta and yellow when addressed, the third sub-pixel being capable of displaying at least one color different from the colors capable of being displayed by the first sub-pixel and at least one color different from the colors capable of being displayed by the second sub-pixel.
7. The display of claim 6 further comprising a first color filter extending across the first sub-pixel, a second color filter extending across the second sub-pixel and a third color filter extending across the third sub-pixel.
8. The display of claim 6 wherein:
(a) the first sub-pixel is capable of displaying white, cyan and red;
(b) the second sub-pixel is capable of displaying white, magenta and green; and
(c) the third sub-pixel is capable of displaying white, yellow and blue.

This application is a continuation of prior application Ser. No. 09/289,507 filed Apr. 9, 1999 (now U.S. Pat. No. 7,075,502), which in turn claims priority to U.S. Ser. No. 60/081,362 filed Apr. 10, 1998. The entire disclosures of both these prior applications are incorporated by reference herein.

The present invention relates to electronic displays and, in particular, to full color electrophoretic displays and methods of creating full-color microencapsulated eletrophoretic displays.

There are a number of enhanced reflective display media which offer numerous benefits such as enhanced optical appearance, the ability to be constructed in large form factors, capable of being formed using flexible substrates, characterized by easy manufacturability and manufactured at low cost. Such reflective display media include microencapsulated electrophoretic displays, rotating ball displays, suspended particle displays, and composites of liquid crystals with polymers (known by many names including but not limited to polymer dispersed liquid crystals, polymer stabilized liquid crystals, and liquid crystal gels). Electrophoretic display media, generally characterized by the movement of particles through an applied electric field, are highly reflective, can be made bistable, and consume very little power. Further, encapsulated electrophoretic displays also may be printed. These properties allow encapsulated electrophoretic display media to be used in many applications for which traditional electronic displays are not suitable, such as flexible, printed displays.

While bichromatic electrophoretic displays have been demonstrated in a limited range of colors (e.g. black/white or yellow/red), to date there has not been successful commercialization of a full-color electrophoretic display. Indeed, no reflective display technology to date has shown itself capable of satisfactory color. Full-color reflective displays typically are deficient when compared to emissive displays in at least two important areas: brightness and color saturation.

One traditional technique for achieving a bright, full-color display which is known in the art of emissive displays is to create sub-pixels that are red, green and blue. In this system, each pixel has two states: on, or the emission of color; and off. Since light blends from these sub-pixels, the overall pixel can take on a variety of colors and color combinations. In an emissive display, the visual result is the summation of the wavelengths emitted by the sub-pixels at selected intensities, white is seen when red, green and blue are all active in balanced proportion or full intensity. The brightness of the white image is controlled by the intensities of emission of light by the sub-pixels. Black is seen when none are active or, equivalently, when all are emitting at zero intensity. As an additional example, a red visual display appears when the red sub-pixel is active while the green and blue are inactive, and thus only red light is emitted.

It is known that this method can be applied to bichromatic reflective displays, typically using the cyan-magenta-yellow subtractive color system. In this system, the reflective sub-pixels absorb characteristic portions of the optical spectrum, rather than generating characteristic portions of the spectrum as do the pixels in an emissive display. White reflects everything, or equivalently absorbs nothing. A colored reflective material reflects light corresponding in wavelength to the color seen, and absorbs the remainder of the wavelengths in the visible spectrum. To achieve a black display, all three sub-pixels are turned on, and they absorb complementary portions of the spectrum.

However, the colors displayed by a full-color display as described above are sub-optimal. For example, to display red, one pixel displays magenta, one displays yellow, and one displays white. The white sub-pixel reduces the saturation of red in the image and reduces display contrast. The overall effect is a washed out red. This further illustrates why no method to date has been capable of generating a high-contrast, high-brightness full color reflective display with good color saturation.

This invention teaches practical ways to achieve brighter, more saturated, reflective full-color displays than previously known, particularly full-color encapsulated, electrophoretic displays.

An object of the invention is to provide a brighter, more satured, reflective full-color display. In some embodiments, the displays are highly flexible, can be manufactured easily, consume little power, and can, therefore, be incorporated into a variety of applications. The invention features a printable display comprising an encapsulated electrophoretic display medium. In an embodiment the display media can be printed and, therefore the display itself can be made inexpensively.

An encapsulated electrophoretic display can be constructed so that the optical state of the display is stable for some length of time. When the display has two states which are stable in this manner, the display is said to be bistable. If more than two states of the display are stable, then the display can be said to be multistable. For the purpose of this invention, the terms bistable and multistable, or generally, stable, will be used to indicate a display in which any optical state remains fixed once the addressing voltage is removed. The definition of a stable state depends on the application for the display. A slowly-decaying optical state can be effectively stable if the optical state is substantially unchanged over the required viewing time. For example, in a display which is updated every few minutes, a display image which is stable for hours or days is effectively bistable or multistable, as the case may be, for that application. In this invention, the terms bistable and multistable also indicate a display with an optical state sufficiently long-lived as to be effectively stable for the application in mind. Alternatively, it is possible to construct encapsulated electrophoretic displays in which the image decays quickly once the addressing voltage to the display is removed (i.e., the display is not bistable or multistable). As will be described, in some applications it is advantageous to use an encapsulated electrophoretic display which is not bistable or multistable. Whether or not an encapsulated electrophoretic display is stable, and its degree of stability, can be controlled through appropriate chemical modification of the electrophoretic particles, the suspending fluid, the capsule, and binder materials.

An encapsulated electrophoretic display may take many forms. The display may comprise capsules dispersed in a binder. The capsules may be of any size or shape. The capsules may, for example, be spherical and may have diameters in the millimeter range or the micron range, but is preferably from ten to a few hundred microns. The capsules may be formed by an encapsulation technique, as described below. Particles may be encapsulated in the capsules. The particles may be two or more different types of particles. The particles may be colored, luminescent, light-absorbing or transparent, for example. The particles may include neat pigments, dyed (laked) pigments or pigment/polymer composites, for example. The display may further comprise a suspending fluid in which the particles are dispersed.

The successful construction of an encapsulated electrophoretic display requires the proper interaction of several different types of materials and processes, such as a polymeric binder and, optionally, a capsule membrane. These materials must be chemically compatible with the electrophoretic particles and fluid, as well as with each other. The capsule materials may engage in useful surface interactions with the electrophoretic particles, or may act as a chemical or physical boundary between the fluid and the binder. Various materials and combinations of materials useful in constructing encapsulated electrophoretic displays are described in co-pending application Ser. No. 09/140,861, the contents of which are incorporated by reference herein.

In some cases, the encapsulation step of the process is not necessary, and the electrophoretic fluid may be directly dispersed or emulsified into the binder (or a precursor to the binder materials) and an effective “polymer-dispersed electrophoretic display” constructed. In such displays, voids created in the binder may be referred to as capsules or microcapsules even though no capsule membrane is present. The binder dispersed electrophoretic display may be of the emulsion or phase separation type.

Throughout the specification, reference will be made to printing or printed. As used throughout the specification, printing is intended to include all forms of printing and coating, including: premetered coatings such as patch die coating, slot or extrusion coating, slide or cascade coating, and curtain coating; roll coating such as knife over roll coating, forward and reverse roll coating; gravure coating; dip coating; spray coating; meniscus coating; spin coating; brush coating; air knife coating; silk screen printing processes; electrostatic printing processes; thermal printing processes; and other similar techniques. A “printed element” refers to an element formed using any one of the above techniques.

As noted above, electrophoretic display elements can be encapsulated. Throughout the Specification, reference will be made to “capsules,” “pixels,” and “sub-pixels.” A pixel display element can be formed by one or more capsules or sub-pixels. A sub-pixel may itself comprise one or more capsules or other structures.

A full color, reflective display having superior saturation and brightness is achieved with a novel display element comprising multichromatic sub-elements. One embodiment of the display employs three sub-pixels, each sub-pixel comprising a capsule including three species of particles which differ visually. Another embodiment of the display employs color filters combined with an encapsulated electrophoretic display to provide different visual states. In still another embodiment, the display employs display elements capable of more than three visual states. In yet another embodiment, the visual display states are selected from specific colors, for example, the primary colors red, green and blue, or their complements, and white and/or black. The display element presents a visual display in response to the application of an electrical signal to at least one of the capsules.

In one aspect, the present invention relates to an electrophoretic display element. The display element comprises a first capsule including a first species of particles having a first optical property and a second species of particles having a second optical property visually different from the first optical property. The display element further comprises a second capsule including a third species of particles having a third optical property and a fourth species of particles having a fourth optical property visually different from the third optical property. The display element presents a visual display in response to the application of an electrical signal to at least one of the first and second capsules. The first optical property and the third optical property can be, but are not required to be, substantially similar in appearance.

The electrophoretic display element can further comprise a fifth species of particles having a fifth optical property visually different from the first and second optical properties in the first capsule. It can also comprise a sixth species of particles having a sixth optical property visually different from the third and fourth optical properties in the second capsule. It can also include a third capsule having a seventh species of particles having a seventh optical property, an eighth species of particles having a eighth optical property, and a ninth species of particles having a ninth optical property.

The electrophoretic display element can include particles such that the first, third and seventh optical properties have a white visual appearance. The electrophoretic display element can include particles such that the second, fourth and eighth optical properties have a black visual appearance. The electrophoretic display element can have at least one of the optical properties be red, green, blue, yellow, cyan, or magenta in visual appearance. The electrophoretic display element can have at least one of the optical properties comprising color, brightness, or reflectivity.

The electrophoretic display element can have capsules which include a suspending fluid. The suspending fluid can be substantially clear, or it can be dyed or otherwise colored.

In another aspect, the present invention relates to a display apparatus comprising at least one display element which includes at least two capsules such as are described above and at least one electrode adjacent to the display element, wherein the apparatus presents a visual display in response to the application of an electrical signal via the electrode to the display element.

The display apparatus can include a plurality of electrodes adjacent the display element. The plurality of electrodes can include at least one which has a size different from others of the plurality of electrodes, and can include at least one which has a color different from others of the plurality of electrodes.

In another aspect, the present invention relates to an electrophoretic display element comprising a capsule containing a first species of particles having a first optical property, a second species of particles having a second optical property visually different from the first optical property, a third species of particles having a third optical property visually different from the first and second optical properties and a fourth species of particles having a fourth optical property visually different from the first, second, and third optical properties such that the element presents a visual display in response to the application of an electrical signal to the capsule. The electrophoretic display element can also include a suspending fluid within the capsule.

In yet another aspect, the present invention relates to an electrophoretic display element comprising a capsule containing a first species of particles having a first optical property, a second species of particles having a second optical property visually different from the first optical property, a third species of particles having a third optical property visually different from the first and second optical properties, a fourth species of particles having a fourth optical property visually different from the first, second, and third optical properties, and a fifth species of particles having a fifth optical property visually different from the first, second, third, and fourth optical properties such that the element presents a visual display in response to the application of an electrical signal to said capsule. The electrophoretic display element can also include a suspending fluid within the capsule.

In still another aspect, the present invention relates to a method of manufacturing an electrophoretic display. The manufacturing method comprises the steps of providing a first capsule containing a first species of particles having a first optical property and a second species of particles having a second optical property visually different from the first optical property, and providing a second capsule containing a third species of particles having a third optical property and a fourth species of particles having a fourth optical property visually different from the third optical property, such that when an electrical signal is applied to at least one of the first and second capsules the element presents a visual display in response to the signal. In this method of manufacture, the first optical property and the third optical property can be substantially similar in appearance.

In still a further aspect, the present invention relates to a method of manufacturing an electrophoretic display. This manufacturing method comprises the steps of providing a first capsule containing a first species of particles having a first optical property, a second species of particles having a second optical property visually different from the first optical property and containing a third species of particles having a third optical property visually different from the first and second optical properties, providing a second capsule containing a fourth species of particles having a fourth optical property, a fifth species of particles having a fifth optical property visually different from the fourth optical property and a sixth species of particles having a sixth optical property visually different from the fourth and fifth optical properties, and providing a third capsule containing a seventh species of particles having a seventh optical property, an eighth species of particles having a eighth optical property visually different from the seventh optical property, and a ninth species of particles having a ninth optical property visually different from the seventh and eighth optical properties, such that when an electrical signal is applied to at least one of the first, second and third capsules, the element presents a visual display in response to the signal.

The manufacturing method can include the step of providing a first capsule wherein the third optical property is red visual appearance, or is yellow visual appearance. The manufacturing method can include the step of providing a second capsule wherein the sixth optical property is green visual appearance, or is cyan visual appearance. The manufacturing method can include the step of providing a third capsule wherein the ninth optical property is blue visual appearance, or is magenta visual appearance. The manufacturing method can include the step of providing capsules wherein the first, fourth and seventh optical properties are white visual appearance, or wherein the second, fifth and eighth optical properties are black visual appearance.

The invention is pointed out with particularity in the appended claims. The advantages of the invention described above, together with further advantages, may be better understood by referring to the following description taken in conjunction with the accompanying drawings. In the drawings, like reference characters generally refer to the same parts throughout the different views. Also, the drawings are not necessarily to scale, emphasis instead generally being placed upon illustrating the principles of the invention.

FIG. 1A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which a smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.

FIG. 1B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.

FIG. 1C is a diagrammatic top-down view of one embodiment of a rear-addressing electrode structure.

FIG. 1D is a diagrammatic perspective view of one embodiment of a display element having three sub-pixels, each sub-pixel comprising a relatively larger rear electrode and a relatively smaller rear electrode.

FIG. 2A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer associated with the larger electrode in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.

FIG. 2B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer associated with the larger electrode in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.

FIG. 2C is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer disposed below the larger electrode in which the smaller electrode has been placed at a voltage relative to the large electrode causing the particles to migrate to the smaller electrode.

FIG. 2D is a diagrammatic side view of an embodiment of a rear-addressing electrode structure having a retroreflective layer disposed below the larger electrode in which the larger electrode has been placed at a voltage relative to the smaller electrode causing the particles to migrate to the larger electrode.

FIG. 3A is a diagrammatic side view of an embodiment of an addressing structure in which a direct-current electric field has been applied to the capsule causing the particles to migrate to the smaller electrode.

FIG. 3B is a diagrammatic side view of an embodiment of an addressing structure in which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule, obscuring a rear substrate.

FIG. 3C is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which a direct-current electric field has been applied to the capsule causing the particles to migrate to the smaller electrode, revealing a rear substrate.

FIG. 3D is a diagrammatic side view of an embodiment of an addressing structure having transparent electrodes, in which an alternating-current electric field has been applied to the capsule causing the particles to disperse into the capsule.

FIG. 3E is a diagrammatic side view of an embodiment of an addressing structure for a display element having three sub-pixels.

FIG. 3F is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure addressing a display element to appear white.

FIG. 3G is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure addressing a display element to appear red.

FIG. 3H is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure addressing a display element to absorb red light.

FIG. 3I is a diagrammatic side view of an embodiment of a dual particle curtain mode addressing structure for a display element having three sub-pixels, in which the display is addressed to appear red.

FIG. 3J is a diagrammatic side view of another embodiment of a dual particle curtain mode addressing structure for a display element.

FIG. 3K is a diagrammatic plan view of an embodiment of an interdigitated electrode structure.

FIG. 3L is a diagrammatic side view of another embodiment of a dual particle curtain mode display structure having a dyed fluid and two species of particles, addressed to absorb red.

FIG. 3M is a diagrammatic side view of another embodiment of a dual particle curtain mode display structure having clear fluid and three species of particles, addressed to absorb red.

FIG. 4A is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display having colored electrodes and a white electrode, in which the colored electrodes have been placed at a voltage relative to the white electrode causing the particles to migrate to the colored electrodes.

FIG. 4B is a diagrammatic side view of an embodiment of a rear-addressing electrode structure for a particle-based display having colored electrodes and a white electrode, in which the white electrode has been placed at a voltage relative to the colored electrodes causing the particles to migrate to the white electrode.

FIG. 5 is a diagrammatic side view of an embodiment of a color display element having red, green, and blue particles of different electrophoretic mobilities.

FIGS. 6A-6B depict the steps taken to address the display of FIG. 5 to display red.

FIGS. 7A-7D depict the steps taken to address the display of FIG. 5 to display blue.

FIGS. 8A-8C depict the steps taken to address the display of FIG. 5 to display green.

FIG. 9 is a cross-sectional view of a rear electrode addressing structure that is formed by printing.

FIG. 10 is a perspective view of an embodiment of a control grid addressing structure.

An electronic ink is an optoelectronically active material that comprises at least two phases: an electrophoretic contrast media phase and a coating/binding phase. The electrophoretic phase comprises, in some embodiments, a single species of electrophoretic particles dispersed in a clear or dyed medium, or more than one species of electrophoretic particles having distinct physical and electrical characteristics dispersed in a clear or dyed medium. In some embodiments the electrophoretic phase is encapsulated, that is, there is a capsule wall phase between the two phases. The coating/binding phase includes, in one embodiment, a polymer matrix that surrounds the electrophoretic phase. In this embodiment, the polymer in the polymeric binder is capable of being dried, crosslinked, or otherwise cured as in traditional inks, and therefore a printing process can be used to deposit the electronic ink onto a substrate.

In one embodiment, the ink may comprise sub-pixels capable of displaying different colors. Sub-pixels may be grouped to form pixels. In one particular embodiment, each sub-pixel contains red particles, green particles, and blue particles, respectively. In another particular embodiment, each sub-pixel contains cyan particles, yellow particles, and magenta particles, respectively. In each example, each sub-pixel can additionally include particles which are white and particles which are black. By addressing each sub-pixel to display some fraction of its colored particles, and some portion of the white and black particles, a pixel can be caused to give an appearance corresponding to a selected color at a selected brightness level.

An electronic ink is capable of being printed by several different processes, depending on the mechanical properties of the specific ink employed. For example, the fragility or viscosity of a particular ink may result in a different process selection. A very viscous ink would not be well-suited to deposition by an inkjet printing process, while a fragile ink might not be used in a knife over roll coating process.

The optical quality of an electronic ink is quite distinct from other electronic display materials. The most notable difference is that the electronic ink provides a high degree of both reflectance and contrast because it is pigment based (as are ordinary printing inks). The light scattered from the electronic ink comes from a very thin layer of pigment close to the top of the viewing surface. In this respect it resembles an ordinary, printed image. Also, electronic ink is easily viewed from a wide range of viewing angles in the same manner as a printed page, and such ink approximates a Lambertian contrast curve more closely than any other electronic display material. Since electronic ink can be printed, it can be included on the same surface with any other printed material, including traditional inks. Electronic ink can be made optically stable in all display configurations, that is, the ink can be set to a persistent optical state. Fabrication of a display by printing an electronic ink is particularly useful in low power applications because of this stability.

Electronic ink displays are novel in that they can be addressed by DC voltages and draw very little current. As such, the conductive leads and electrodes used to deliver the voltage to electronic ink displays can be of relatively high resistivity. The ability to use resistive conductors substantially widens the number and type of materials that can be used as conductors in electronic ink displays. In particular, the use of costly vacuum-sputtered indium tin oxide (ITO) conductors, a standard material in liquid crystal devices, is not required. Aside from cost savings, the replacement of ITO with other materials can provide benefits in appearance, processing capabilities (printed conductors), flexibility, and durability. Additionally, the printed electrodes are in contact only with a solid binder, not with a fluid layer (like liquid crystals). This means that some conductive materials, which would otherwise dissolve or be degraded by contact with liquid crystals, can be used in an electronic ink application. These include opaque metallic inks for the rear electrode (e.g., silver and graphite inks), as well as conductive transparent inks for either substrate. These conductive coatings include semiconducting colloids, examples of which are indium tin oxide and antimony-doped tin oxide. Organic conductors (polymeric conductors and molecular organic conductors) also may be used. Polymers include, but are not limited to, polyaniline and derivatives, polythiophene and derivatives, poly3,4-ethylenedioxythiophene (PEDOT) and derivatives, polypyrrole and derivatives, and polyphenylenevinylene (PPV) and derivatives. Organic molecular conductors include, but are not limited to, derivatives of naphthalene, phthalocyanine, and pentacene. Polymer layers can be made thinner and more transparent than with traditional displays because conductivity requirements are not as stringent.

As an example, there are a class of materials called electroconductive powders which are also useful as coatable transparent conductors in electronic ink displays. One example is Zelec ECP electroconductive powders from DuPont Chemical Co. of Wilmington, Del.

It is possible to produce any selected color from the superposition of suitable proportions of three properly chosen colors. In one embodiment, the colors red, green, and blue can be combined in various proportions to produce an image which is perceived as a selected color. Emissive or transmissive displays operate according to additive rules, where the perceived color is created by summing the emission wavelengths of a plurality of emitting or transmitting objects. For an emissive or transmissive display which includes three sub-pixels, one of which can produce red light, one green light, and one blue light, respectively, one can generate all colors, as well as white and black. At one extreme, the combination of all three at full intensity is perceived as white, and at the other, the combination of all three at zero intensity is perceived as black. Specific combinations of controlled proportions of these three colors can be used to represent other colors.

In a reflective display, the light which a viewer perceives is the portion of the spectrum which is not absorbed when the light to be reflected falls on the reflector surface. One may thus consider a reflecting system as a subtractive system, that is, that each reflective surface “subtracts” from the light that portion which the reflector absorbs. The color of a reflector represents the wavelengths of light the reflector absorbs. A yellow reflector absorbs substantially blue light. A magenta reflector absorbs substantially green light. A cyan reflector absorbs substantially red light. Thus, in an alternative embodiment employing reflectors, nearly the same results as an emissive system can be obtained by use of the three colors cyan, yellow, and magenta as the primary colors, from which all other colors, including black but not white, can be derived. To obtain white from such a display, one must further introduce a third state per sub-pixel, namely white.

One approach which may be taken to overcome the shortcomings inherent in two state displays is to create a display comprising individual pixels or pixels comprising sub-pixels that can support multiple color states. The use of multiple color states permits more robust color rendition and provides better contrast than is possible with two color states per pixel or per sub-pixel. For example, using a microencapsulated electrophoretic display, a single microcapsule with five kinds of particles could display white, cyan, magenta, yellow, or black all with excellent saturation. By foregoing black and using cyan/magenta/yellow to combine to black, a similar effect can be achieved with a display element capable of four color states.

The invention can also utilize any reflective display element that can create three color states within a single sub-pixel, where sub-pixels are combined to generate a variety of overall pixel colors. Such a display is capable of greatly improved appearance yet relies on only three color states per sub-pixel instead of four or five or more. A sub-pixel having only three color states can have advantages with regard to the operation of the display. Fewer and simpler applied voltage signals are needed to operate each sub-pixel of the display element, A sub-pixel having fewer stable states may be capable of being addressed more quickly than one with more stable states.

Various methods are possible by which three color states could be achieved within a single addressable region, which can be a display element sub-pixel. For example, a microencapsulated electrophoretic display element sub-pixel may contain particles in a clear suspension medium. A simple addressing method is to provide white particles having a positive charge, cyan particles having a negative charge, and red particles having no charge. In this example, white is achieved when the top electrode is negative and the bottom electrodes are both positive. Cyan is achieved when the top electrode is positive and the bottom electrodes are both negative. Red is achieved when the top electrode is set to ground, one bottom electrode is positive and attracts the cyan particles, and the other bottom electrode is negative and attracts the white particles, so that the red particles are uppermost and are seen.

Another example combines top and bottom motion with a sideways or so-called in-plane switching, control grid or shutter-effect method. In one example, red particles have strong positive charge, black particles have lesser positive charge, and the sub-pixel of the display incorporates a white sheet behind a clear bottom electrode. The clear bottom electrode comprises a larger sub-electrode and a smaller sub-electrode. In this example, using a shutter effect, red is achieved when the top electrode has a negative voltage and the bottom electrode, including both subelectrodes, has a positive voltage. Black is achieved when the top electrode has a positive voltage and the bottom electrode, including both subelectrodes, has a negative voltage. White is achieved when the smaller subelectrode of the bottom electrode is switched to a negative voltage but the top electrode and the larger subelectrode of the bottom electrode is switched to a less negative voltage. Thus the red and black particles are attracted to cluster at the smaller sub-electrode, with the slower black particles clustering on top and blocking from sight the red particles, and the bulk of the microcapsule is clear, allowing the white sheet to be visible. The top electrode may be masked so that the clustered particles are not visible. Additionally, the backing sheet could be replaced with a backlight or color filter and backlight. In another embodiment, a brief alternating voltage signal may be used prior to addressing methods described above to mix the particles into a random order.

While the methods described discuss particles, any combination of dyes, liquids droplets and transparent regions that respond to electrophoretic effects could also be used. Particles of various optical effects may be combined in any suitable proportion. For example, certain colors may be over- or under-populated in the electrophoretic suspension to account for the sensitivities of the human eye and to thereby achieve a more pleasing or uniform effect. Similarly, the sizes of the sub-pixels may also be disproportionate to achieve various optical effects.

Although these examples describe microencapsulated electrophoretic displays, the invention can be utilized across other reflective displays including liquid crystal, polymer-dispersed liquid crystal, rotating ball, suspended particle and any other reflective display capable of imaging three colors. For example, a bichromal rotating ball (or pyramid, cube, etc.) could be split into regions of multiple colors. One way to address such a display element would be to provide differing charge characteristics (such as charged vertices in the case of the pyramid) and to use various combinations and sequences of electrode voltage potentials across the surrounding top, bottom, or side electrodes to rotate the shape in a desired manner. In short, many addressing schemes are possible by which a sub-pixel in a direct color reflective display could be switched among three colors. Such switching mechanism will vary by the nature of the display and any suitable means may be used.

One embodiment of the invention is to separate each pixel into three sub-pixels, each sub-pixel being capable of displaying three color states, and to choose as the color state combinations a first sub-pixel being capable of displaying white, cyan or red, a second sub-pixel being capable of displaying white, magenta or green, and a third sub-pixel being capable of displaying white, yellow or blue. As has already been explained, for a reflective display, black can be displayed with the three sub-pixels turned to red, green and blue, respectively. This display achieves a more saturated black than is achieved under the two-state system. Alternatively, red is displayed with the sub-pixels turned to red, magenta and yellow, respectively, which offers a more saturated red than is obtained with a two-state system. Other colors may be obtained by suitable choices of the individual states of the sub-pixels.

Another embodiment of the invention is to separate each pixel into three sub-pixels, each sub-pixel being capable of displaying three color states, and to choose as the color state combinations a first sub-pixel being capable of displaying white, cyan or black, a second sub-pixel being capable of displaying white, magenta or black, and a third sub-pixel being capable of displaying white, yellow or black. In this embodiment, black and white are displayed directly with high saturation. For example, to display red, the first (cyan) sub-pixel is set to either white or black to achieve a dimmer or brighter color, respectively, the second sub-pixel is set to magenta, and the last sub-pixel is set to yellow.

Another embodiment of the invention is to separate each pixel into three sub-pixels, each sub-pixel being capable of displaying three color states, and to choose as the color state combinations a first sub-pixel being capable of displaying white, red or black, a second sub-pixel being capable of displaying white, green or black, and a third sub-pixel being capable of displaying white, blue or black. In this embodiment, black and white are displayed directly with high saturation. For example, to display red, the first sub-pixel is set to red, and the second and the third sub-pixels are set to either white or black to achieve a dimmer or brighter color, respectively.

While the embodiments above describe a pixel of three sub-pixels, each sub-pixel having three possible color states, the invention is embodied by any pixel containing two or more sub-pixels, where at least one sub-pixel can achieve three or more colors. In this manner a better effect can be achieved for reflective displays than can be achieved by adopting the simple two-state sub-pixel color change technique that is common to emissive displays.

Additionally, the invention can be extended to four or more color states to permit full color displays without the need for sub-pixels, and illustrates addressing mechanisms that work for three states and which can be extended or combined to achieve a display with four or more states.

Another means of generating color in a microencapsulated display medium is the use of color filters in conjunction with a contrast-generating optical element. One manifestation of this technique is to use a pixel element which switches between white and black. This, in conjunction with the color filter, allows for switching between a light and dark colored state to occur. However, it is known to those skilled in the art that different numbers of color filters (ranging from one to three) can be used in a sub-pixel, depending on how many colors are desired. Also, the microencapsulated particle display can switch between colors other than white and black. In this case, it is advantageous to use a color filter which is opposed (in a color sense) to the color of the pixel. For example, a yellow color filter used with a blue or white electrophoretic display would result in a green or yellow color to that element.

Additionally, there is an electrophoretic device known as a “shutter mode” display, in which particles are switched electrically between a widely-dispersed state on one electrode and a narrow band on the other electrode. Such a device can act as a transmissive light valve or reflective display. Color filters can be used with such a device.

Referring now to FIGS. 1A and 1B, an addressing scheme for controlling particle-based displays is shown in which electrodes are disposed on only one side of a display, allowing the display to be rear-addressed. Utilizing only one side of the display for electrodes simplifies fabrication of displays. For example, if the electrodes are disposed on only the rear side of a display, both of the electrodes can be fabricated using opaque materials, which may be colored, because the electrodes do not need to be transparent.

FIG. 1A depicts a single capsule 20 of an encapsulated display media. In brief overview, the embodiment depicted in FIG. 1A includes a capsule 20 containing at least one particle 50 dispersed in a suspending fluid 25. The capsule 20 is addressed by a first electrode 30 and a second electrode 40. The first electrode 30 is smaller than the second electrode 40. The first electrode 30 and the second electrode 40 may be set to voltage potentials which affect the position of the particles 50 in the capsule 20.

The particles 50 represent 0.1% to 20% of the volume enclosed by the capsule 20. In some embodiments the particles 50 represent 2.5% to 17.5% of the volume enclosed by capsule 20. In preferred embodiments, the particles 50 represent 5% to 15% of the volume enclosed by the capsule 20. In more preferred embodiments the particles 50 represent 9% to 11% of the volume defined by the capsule 20. In general, the volume percentage of the capsule 20 that the particles 50 represent should be selected so that the particles 50 expose most of the second, larger electrode 40 when positioned over the first, smaller electrode 30. As described in detail below, the particles 50 may be colored any one of a number of colors. The particles 50 may be either positively charged or negatively charged.

The particles 50 are dispersed in a dispersing fluid 25. The dispersing fluid 25 should have a low dielectric constant. The fluid 25 may be clear, or substantially clear, so that the fluid 25 does not inhibit viewing the particles 50 and the electrodes 30, 40 from position 10. In other embodiments, the fluid 25 is dyed. In some embodiments the dispersing fluid 25 has a specific gravity matched to the density of the particles 50. These embodiments can provide a bistable display media, because the particles 50 do not tend to move in certain compositions absent an electric field applied via the electrodes 30, 40.

The electrodes 30, 40 should be sized and positioned appropriately so that together they address the entire capsule 20. There may be exactly one pair of electrodes 30, 40 per capsule 20, multiple pairs of electrodes 30, 40 per capsule 20, or a single pair of electrodes 30, 40 may span multiple capsules 20. In the embodiment shown in FIGS. 1A and 1B, the capsule 20 has a flattened, rectangular shape. In these embodiments, the electrodes 30, 40 should address most, or all, of the flattened surface area adjacent the electrodes 30, 40. The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40. It should be noted that reference to “smaller” in connection with the electrode 30 means that the electrode 30 addresses a smaller amount of the surface area of the capsule 20, not necessarily that the electrode 30 is physically smaller than the larger electrode 40. For example, multiple capsules 20 may be positioned such that less of each capsule 20 is addressed by the “smaller” electrode 30, even though both electrodes 30, 40 are equal in size. It should also be noted that, as shown in FIG. 1C, electrode 30 may address only a small corner of a rectangular capsule 20 (shown in phantom view in FIG. 1C), requiring the larger electrode 40 to surround the smaller electrode 30 on two sides in order to properly address the capsule 20. Selection of the percentage volume of the particles 50 and the electrodes 30, 40 in this manner allow the encapsulated display media to be addressed as described below.

Electrodes may be fabricated from any material capable of conducting electricity so that electrode 30, 40 may apply an electric field to the capsule 20. As noted above, the rear-addressed embodiments depicted in FIGS. 1A and 1B allow the electrodes 30, 40 to be fabricated from opaque materials such as solder paste, copper, copper-clad polyimide, graphite inks, silver inks and other metal-containing conductive inks. Alternatively, electrodes may be fabricated using transparent materials such as indium tin oxide and conductive polymers such as polyaniline or polythiopenes. Electrodes 30, 40 may be provided with contrasting optical properties. In some embodiments, one of the electrodes has an optical property complementary to optical properties of the particles 50. Alternatively, since the electrodes need not be transparent, an electrode can be constructed so as to display a selected color.

In one embodiment, the capsule 20 contains positively charged black particles 50, and a substantially clear suspending fluid 25. The first, smaller electrode 30 is colored black, and is smaller than the second electrode 40, which is colored white or is highly reflective. When the smaller, black electrode 30 is placed at a negative voltage potential relative to larger, white electrode 40, the positively-charged particles 50 migrate to the smaller, black electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, white electrode 40 and the smaller, black electrode 30, creating an effect which is largely white. Referring to FIG. 1B, when the smaller, black electrode 30 is placed at a positive voltage potential relative to the larger, white electrode 40, particles 50 migrate to the larger, white electrode 40 and the viewer is presented a mixture of the black particles 50 covering the larger, white electrode 40 and the smaller, black electrode 30, creating an effect which is largely black. In this manner the capsule 20 may be addressed to display either a white visual state or a black visual state.

Other two-color schemes are easily provided by varying the color of the smaller electrode 30 and the particles 50 or by varying the color of the larger electrode 40. For example, varying the color of the larger electrode 40 allows fabrication of a rear-addressed, two-color display having black as one of the colors. Alternatively, varying the color of the smaller electrode 30 and the particles 50 allow a rear-addressed two-color system to be fabricated having white as one of the colors. Further, it is contemplated that the particles 50 and the smaller electrode 30 can be different colors. In these embodiments, a two-color display may be fabricated having a second color that is different from the color of the smaller electrode 30 and the particles 50. For example, a rear-addressed, orange-white display may be fabricated by providing blue particles 50, a red, smaller electrode 30, and a white (or highly reflective) larger electrode 40. In general, the optical properties of the electrodes 30, 40 and the particles 50 can be independently selected to provide desired display characteristics. In some embodiments the optical properties of the dispersing fluid 25 may also be varied, e.g. the fluid 25 may be dyed.

In another embodiment, this technique may be used to provide a full color display. Referring now to FIG. 1D, a pixel embodiment is depicted that comprises three sub-pixels. It should be understood that although FIG. 1D depicts a hexagonal pixel having equally-sized sub-pixels, a pixel may have any shape and may be comprised of unequal sub-pixels. The sub-pixels may each be contained in a single large capsule, or each may be distributed across any number of small microcapsules or microcells. For the purposed of illustration, the simpler case of a single large sub-cell for each sub-pixel is shown. In both cases we refer to the regions, 20, 20′, 20″, as capsules. Thus, a first capsule 20 contains positively charged black particles 50 and a substantially clear suspending fluid 25. A first, smaller electrode 30 is colored black, and is smaller than the second electrode 40, which is colored red. When the smaller, black electrode 30 is placed at a negative voltage potential relative to larger, red electrode 40, the positively-charged particles 50 migrate to the smaller, black electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, red electrode 40 and the smaller, black electrode 30, creating an effect which is largely red. When the smaller, black electrode 30 is placed at a positive voltage potential relative to the larger, red electrode 40, particles 50 migrate to the larger, red electrode 40 and the viewer is presented a mixture of the black particles 50 covering the larger, red electrode 40 and the smaller, black electrode 30, creating an effect which is largely black. In this manner the first capsule 20 may be addressed to display either a red visual state or a black visual state. One can equally have a second capsule 20′ wherein the larger electrode 40′ is green, and a third capsule 20″ wherein the larger electrode 40″ is blue. A second capsule 20′ contains positively charged black particles 50′ and a substantially clear suspending fluid 25′. A first, smaller electrode 30′ is colored black, and is smaller than the second electrode 40′, which is colored green. When the smaller, black electrode 30′ is placed at a negative voltage potential relative to larger, green electrode 40′, the positively-charged particles 50′ migrate to the smaller, black electrode 30′. The effect to a viewer of the capsule 20′ located at position 10′ is a mixture of the larger, green electrode 40′ and the smaller, black electrode 30′, creating an effect which is largely green. When the smaller, black electrode 30′ is placed at a positive voltage potential relative to the larger, green electrode 40′, particles 50′ migrate to the larger, green electrode 40′ and the viewer is presented a mixture of the black particles 50′ covering the larger, green electrode 40′ and the smaller, black electrode 30′, creating an effect which is largely black. Similarly, a third capsule 20″ contains positively charged black particles 50″ and a substantially clear suspending fluid 25″. A first, smaller electrode 30″ is colored black, and is smaller than the second electrode 40″, which is colored blue. When the smaller, black electrode 30″ is placed at a negative voltage potential relative to larger, blue electrode 40″, the positively-charged particles 50″ migrate to the smaller, black electrode 30″. The effect to a viewer of the capsule 20″ located at position 10″ is a mixture of the larger, blue electrode 40″ and the smaller, black electrode 30″, creating an effect which is largely blue. When the smaller, black electrode 30″ is placed at a positive voltage potential relative to the larger, blue electrode 40″, particles 50″ migrate to the larger, blue electrode 40″ and the viewer is presented a mixture of the black particles 50″ covering the larger, blue electrode 40″ and the smaller, black electrode 30″, creating an effect which is largely black. Further, the relative intensities of these colors can be controlled by the actual voltage potentials applied to the electrodes. By choosing appropriate combinations of the three colors, one may create a visual display which appears as the effective combination of the selected colors as an additive process. As an alternative embodiment, the first, second and third capsules can have larger electrodes 40, 40′, 40″ which are respectively colored cyan, yellow, and magenta. Operation of the alternative cyan, yellow, and magenta embodiment is analogous to that of the red, green, and blue embodiment, with the feature that the color to be displayed is selected by a subtractive process.

In other embodiments the larger electrode 40 may be reflective instead of white. In these embodiments, when the particles 50 are moved to the smaller electrode 30, light reflects off the reflective surface 60 associated with the larger electrode 40 and the capsule 20 appears light in color, e.g. white (see FIG. 2A). When the particles 50 are moved to the larger electrode 40, the reflecting surface 60 is obscured and the capsule 20 appears dark (see FIG. 2B) because light is absorbed by the particles 50 before reaching the reflecting surface 60. The reflecting surface 60 for the larger electrode 40 may possess retroreflective properties, specular reflection properties, diffuse reflective properties or gain reflection properties. In certain embodiments, the reflective surface 60 reflects light with a Lambertian distribution The surface 60 may be provided as a plurality of glass spheres disposed on the electrode 40, a diffractive reflecting layer such as a holographically formed reflector, a surface patterned to totally internally reflect incident light, a brightness-enhancing film, a diffuse reflecting layer, an embossed plastic or metal film, or any other known reflecting surface. The reflecting surface 60 may be provided as a separate layer laminated onto the larger electrode 40 or the reflecting surface 60 may be provided as a unitary part of the larger electrode 40. In the embodiments depicted by FIGS. 2C and 2D, the reflecting surface may be disposed below the electrodes 30, 40 vis-á-vis the viewpoint 10. In these embodiments, electrode 30 should be transparent so that light may be reflected by surface 60. In other embodiments, proper switching of the particles may be accomplished with a combination of alternating-current (AC) and direct-current (DC) electric fields and described below in connection with FIGS. 3A-3D.

In still other embodiments, the rear-addressed display previously discussed can be configured to transition between largely transmissive and largely opaque modes of operation (referred to hereafter as “shutter mode”). Referring back to FIGS. 1A and 1B, in these embodiments the capsule 20 contains at least one positively-charged particle 50 dispersed in a substantially clear dispersing fluid 25. The larger electrode 40 is transparent and the smaller electrode 30 is opaque. When the smaller, opaque electrode 30 is placed at a negative voltage potential relative to the larger, transmissive electrode 40, the particles 50 migrate to the smaller, opaque electrode 30. The effect to a viewer of the capsule 20 located at position 10 is a mixture of the larger, transparent electrode 40 and the smaller, opaque electrode 30, creating an effect which is largely transparent. Referring to FIG. 1B, when the smaller, opaque electrode 30 is placed at a positive voltage potential relative to the larger, transparent electrode 40, particles 50 migrate to the second electrode 40 and the viewer is presented a mixture of the opaque particles 50 covering the larger, transparent electrode 40 and the smaller, opaque electrode 30, creating an effect which is largely opaque. In this manner, a display formed using the capsules depicted in FIGS. 1A and 1B may be switched between transmissive and opaque modes. Such a display can be used to construct a window that can be rendered opaque. Although FIGS. 1A-2D depict a pair of electrodes associated with each capsule 20, it should be understood that each pair of electrodes may be associated with more than one capsule 20.

A similar technique may be used in connection with the embodiment of FIGS. 3A, 3B, 3C, and 3D. Referring to FIG. 3A, a capsule 20 contains at least one dark or black particle 50 dispersed in a substantially clear dispersing fluid 25. A smaller, opaque electrode 30 and a larger, transparent electrode 40 apply both direct-current (DC) electric fields and alternating-current (AC) fields to the capsule 20. A DC field can be applied to the capsule 20 to cause the particles 50 to migrate towards the smaller electrode 30. For example, if the particles 50 are positively charged, the smaller electrode is placed a voltage that is more negative than the larger electrode 40. Although FIGS. 3A-3D depict only one capsule per electrode pair, multiple capsules may be addressed using the same electrode pair.

The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode is one-quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40.

Causing the particles 50 to migrate to the smaller electrode 30, as depicted in FIG. 3A, allows incident light to pass through the larger, transparent electrode 40 and be reflected by a reflecting surface 60. In shutter mode, the reflecting surface 60 is replaced by a translucent layer, a transparent layer, or a layer is not provided at all, and incident light is allowed to pass through the capsule 20, i.e. the capsule 20 is transmissive. If the translucent layer or the transparent layer comprises a color, such as a color filter, the light which is transmitted will be those wavelengths that the filter passes, and the reflected light will consist of those wavelengths that the filter reflects, while the wavelengths that the filter absorbs will be lost. The visual appearance of a shutter mode display may thus depend on whether the display is in a transmissive or reflective condition, on the characteristics of the filter, and on the position of the viewer.

Referring now to FIG. 3B, the particles 50 are dispersed into the capsule 20 by applying an AC field to the capsule 20 via the electrodes 30, 40. The particles 50, dispersed into the capsule 20 by the AC field, block incident light from passing through the capsule 20, causing it to appear dark at the viewpoint 10. The embodiment depicted in FIGS. 3A-3B may be used in shutter mode by not providing the reflecting surface 60 and instead providing a translucent layer, a transparent layer, a color filter layer, or no layer at all. In shutter mode, application of an AC electric field causes the capsule 20 to appear opaque. The transparency of a shutter mode display formed by the apparatus depicted in FIGS. 3A-3D may be controlled by the number of capsules addressed using DC fields and AC fields. For example, a display in which every other capsule 20 is addressed using an AC field would appear fifty percent transmissive.

FIGS. 3C and 3D depict an embodiment of the electrode structure described above in which electrodes 30, 40 are on “top” of the capsule 20, that is, the electrodes 30, 40 are between the viewpoint 10 and the capsule 20. In these embodiments, both electrodes 30, 40 should be transparent. Transparent polymers can be fabricated using conductive polymers, such as polyaniline, polythiophenes, or indium tin oxide. These materials may be made soluble so that electrodes can be fabricated using coating techniques such as spin coating, spray coating, meniscus coating, printing techniques, forward and reverse roll coating and the like. In these embodiments, light passes through the electrodes 30, 40 and is either absorbed by the particles 50, reflected by retroreflecting layer 60 (when provided), transmitted throughout the capsule 20 (when retroreflecting layer 60 is not provided), or partially transmitted and/or reflected if a color filter is present in place of retroreflecting layer 60.

Referring to FIG. 3E, three sub-pixel capsules 22, 22′ and 22″ each contain at least one white particle 50 dispersed in a substantially clear dispersing fluid 25. In one embodiment, each sub-pixel capsule 22, 22′ and 22″ has a transparent electrode 42, 42′, and 42″ disposed above it and a colored filter 60, 60′ and 60″ disposed below it. A common reflective surface 70 may be shared behind the color filter layer. In an alternative embodiment, the display includes an emissive light source 70

Smaller, opaque electrodes 30, 30′ and 30″ and Larger, transparent electrodes 40, 40′ and 40″ may apply direct-current (DC) electric fields and alternating-current (AC) fields to the capsules 20, 20′ and 20″. A DC field can be applied to the capsules 20, 20′ and 20″ to cause the particles 50, 5050″ to migrate towards the smaller electrodes 30, 30′ and 30″. For example, if the particles 50, 50′ and 50″ are positively charged, the smaller electrodes 30, 30′ and 30″ are placed a voltage that is more negative than the larger electrodes 40, 40′ and 40″.

The smaller electrode 30 is at most one-half the size of the larger electrode 40. In preferred embodiments the smaller electrode 30 is one quarter the size of the larger electrode 40; in more preferred embodiments the smaller electrode 30 is one-eighth the size of the larger electrode 40. In even more preferred embodiments, the smaller electrode 30 is one-sixteenth the size of the larger electrode 40.

Causing the particles 50 to migrate to the smaller electrode 30, as depicted in the first two capsules of FIG. 3E, allows incident light to pass through the larger, transparent electrode 40 filter 60 and reflect off substrate 70. If the first, second and third filters 60, 60′ and 60″ are colored cyan, magenta, and yellow respectively, and the particles 50 are white, this system can display full color in a standard two-color fashion.

The filter layer 60 may be a translucent layer, a transparent layer, a color filter layer, or a layer is not provided at all, and further substrate 70 may be reflective, emissive, translucent or not provided at all. If the layer 60 comprises a color, such as a color filter, the light which is transmitted will be those wavelengths that the filter passes, and the reflected light will consist of those wavelengths that the filter reflects, while the wavelengths that the filter absorbs will be lost. The visual appearance of a the display element in 3E may thus depend on whether the display is in a transmissive or reflective condition, on the characteristics of the filter, and on the position of the viewer. In an alternative embodiment layer 60 may be provided on top of the capsule adjacent to electrode 42.

Referring now to FIGS. 3F-3K, one embodiment of a tri-color pixel is described. Clear electrode 42 allows light to pass into capsule 22 and to strike either white particles W, red particles R, or a colored substrate 60. The substrate 60 can be a combination of color filter and non-colored substrate or it can be provided as a unitary colored substrate. Capsule 22 also includes a suspending fluid that can be dye-colored (possibly eliminating the need for a separate color filter 60) or substantially clear. Electrodes 45 and 35 are transparent and may be equally sized or sized in any suitable manner taking into account the relative particles sizes and mobilities of particles W and R. A gap exists between 45 and 35. Assume that particles W are negatively charged and particles R are positively charged. In FIG. 3F, top electrode 42 is set at a positive voltage potential relative to bottom electrodes 35 and 45, moving particles W to the top and particles R to the bottom and thus white is displayed. In FIG. 3G by reversing the polarity of the electrodes, red is displayed. In both FIGS. 3F and 3G the particles obscure substrate 60. In FIG. 3H electrode 45 is at a negative voltage potential relative to electrode 35, while electrode 42 is at a voltage potential between the potentials of 45 and 35, such as zero. Alternatively, electrode 42 switches between the potentials of 45 and 35 so that over time the effective voltage of 42 is again between the potentials of 45 and 35. In this state, the particles R move toward electrode 45 and the particles W move toward electrode 35 and both particles R and W move away from the gap in the center of the capsule 22. This reveals substrate 60, permitting a third color such as cyan to be imaged. In alternate embodiments the color combinations can differ. The specific colors of the filters and particles need not differ. This system, called “dual particle curtain mode,” can image three arbitrary colors. In a preferred embodiment the colors are as described wherein one color is white and the other two colors are complements. In this manner, referring again to FIG. 3H, if a small portion of red is visible it absorbs part of the light reflected from the cyan substrate and the net result is black, which may be offset by a small portion of visible white. Thus, the pixel in FIG. 3H may appear to be cyan even if some red and white is visible. As mentioned above, the edges of the pixel may be masked to hide particles R and W when in the mode shown in FIG. 3H.

Referring now to FIG. 3I, a full-color pixel is shown comprising three sub-pixels, each operating in the manner taught by FIGS. 3F-3H wherein the colored particles are positively charged, and the white particles are negatively charged. The system may still function with top electrode 42 extended as a common top electrode as shown in FIG. 3I. For example, to achieve the state shown, electrodes 42, 45, 35, 45′, 35′, 45″, 35″ may be set to voltage potentials −30V, 60V, 60V, −60V, +60V, −60V, +60V respectively.

Referring now to FIGS. 3J-3K, an electrode scheme is shown whereby a cluster of microcapsules may be addressed for an entire sub-pixel in a manner similar to those described above. Clear electrode 42 allows light to pass into microcapsules 27 and to strike either white particles W, red particles R, or colored substrate 60. As above, colored substrate 60 may be a combination of color filter and non-colored substrate 60 or colored substrate 60 may be provided as a unitary colored substrate. Capsules 27 include a suspending fluid that may be dye-colored (possibly eliminating the need for a separate color filter 60) or substantially clear. Electrodes 45 and 35 are transparent and may be equally sized or sized in any suitable manner taking into account the relative particle sizes and mobilities of particles W and R. A gap exists between 45 and 35. Assume that particles W are negatively charged and particles R are positively charged. The system operates in the manner described in FIGS. 3F-3K, although for any given microcapsule 27 there may be multiple gaps. FIG. 3K illustrates an embodiment of a suitable electrode pattern in which 45 and 35 are interdigitated.

Referring now to 3L-3M, an alternate embodiment is shown. Again clear electrode 42 allows light to pass into capsule 22 and to strike white particles W or red particles R. In the embodiment shown in FIG. 3L, capsule 22 includes a suspending fluid 62 that is dyed cyan. When electrodes 45 and 35 are set at appropriate voltages particles, R and W move down to electrodes 45 and 35 respectively, where they are obscured by light-absorbing suspending fluid 62. Alternatively, as shown in FIG. 3M, suspending fluid 62 is substantially clear and a third species of cyan particles C is included in capsules 22. The cyan particles have a relatively neutral charge. When electrodes 45 and 35 are set at appropriate voltages particles R and W move down to electrodes 45 and 35 respectively, revealing the cyan particles.

The addressing structure depicted in FIGS. 3A-3M may be used with electrophoretic display media and encapsulated electrophoretic display media FIGS. 3A-3M depict embodiments in which electrode 30, 40 are statically attached to the display media. In certain embodiments, the particles 50 exhibit bistability, that is, they are substantially motionless in the absence of a electric field.

While various of the substrates described above are reflective, an analogous technique may be employed wherein the substrates emit light, with the particles again acting in a “shutter mode” to reveal or obscure light. A preferred substrate for this use is an electroluminiscent (EL) backlight. Such a backlight can be reflective-when inactive, often with a whitish-green color, yet emit lights in various wavelengths when active. By using whitish EL substrates in place of static white reflective substrates, it is possible to construct a full-color reflective display that can also switch its mode of operation to display a range of colors in an emissive state, permitting operation in low ambient light conditions.

FIGS. 4A and 4B depict an embodiment of a rear-addressing electrode structure that creates a reflective color display in a manner similar to halftoning or pointillism. The capsule 20 contains white particles 55 dispersed in a clear suspending fluid 25. Electrodes 42, 44, 46, 48 are colored cyan, magenta, yellow, and white respectively. Referring to FIG. 4A, when the colored electrodes 42, 44, 46 are placed at a positive potential relative to the white electrode 48, negatively-charged particles 55 migrate to these three electrodes, causing the capsule 20 to present to the viewpoint 10 a mix of the white particles 55 and the white electrode 48, creating an effect which is largely white. Referring to FIG. 4B, when electrodes 42, 44, 46 are placed at a negative potential relative to electrode 48, particles 55 migrate to the white electrode 48, and the eye 10 sees a mix of the white particles 55, the cyan electrode 42, the magenta electrode 44, and the yellow electrode 46, creating an effect which is largely black or gray. By addressing the electrodes, any color can be produced that is possible with a subtractive color process. For example, to cause the capsule 20 to display a red color to the viewpoint 10, the yellow electrode 46 and the magenta electrode 42 are set to a voltage potential that is more positive than the voltage potential applied by the cyan electrode 42 and the white electrode 48. Further, the relative intensities of these colors can be controlled by the actual voltage potentials applied to the electrodes. Again, AC current may be used appropriately to randomize the position of the particles as a step in this process.

The technique used in FIGS. 4A and 4B could be used in a similar manner with fewer electrodes and controlling fewer colors. For example, if electrode 42 were not present, the pixel could still display three colors. If electrodes 44 and 46 were colored red and cyan respectively, the capsule could display red, cyan and white. This construction could be used then employed as a sub-pixel, to be matched with similar sub-pixels displaying other trios of colors thus achieving a full-color display as described above.

In another embodiment, depicted in FIG. 5, a color display is provided by a capsule 20 of size d containing multiple species of particles in a clear, dispersing fluid 25. Each species of particles has different optical properties and possess different electrophoretic mobilities (μ) from the other species. In the embodiment depicted in FIG. 5, the capsule 20 contains red particles 52, blue particles 54, and green particles 56, and
R|>|μB|>|μG|
That is, the magnitude of the electrophoretic mobility of the red particles 52, on average, exceeds the electrophoretic mobility of the blue particles 54, on average, and the electrophoretic mobility of the blue particles 54, on average, exceeds the average electrophoretic mobility of the green particles 56. As an example, there may be a species of red particle with a zeta potential of 100 millivolts (mV), a blue particle with a zeta potential of 60 mV, and a green particle with a zeta potential of 20 mV. The capsule 20 is placed between two electrodes 32, 42 that apply an electric field to the capsule. By addressing the capsule 20 with positive and negative voltage fields of varying time durations, it is possible to move any of the various particle species to the top of the capsule to present a certain color.

FIGS. 6A-6B depict the steps to be taken to address the display shown in FIG. 5 to display a red color to a viewpoint 10. Referring to FIG. 6A, all the particles 52, 54, 56 are attracted to one side of the capsule 20 by applying an electric field in one direction. The electric field should be applied to the capsule 20 long enough to attract even the more slowly moving green particles 56 to the electrode 34. Referring to FIG. 6B, the electric field is reversed just long enough to allow the red particles 52 to migrate towards the electrode 32. The blue particles 54 and green particles 56 will also move in the reversed electric field, but they will not move as fast as the red particles 52 and thus will be obscured by the red particles 52. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.

FIGS. 7A-7D depict addressing the display element to a blue state. As shown in FIG. 7A, the particles 52, 54, 56 are initially randomly dispersed in the capsule 20. All the particles 52, 54, 56 are attracted to one side of the capsule 20 by applying an electric field in one direction (shown in FIG. 7B). Referring to FIG. 7C, the electric field is reversed just long enough to allow the red particles 52 and blue particles 54 to migrate towards the electrode 32. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule. Referring to FIG. 7D, the electric field is then reversed a second time and the red particles 52, moving faster than the blue particles 54, leave the blue particles 54 exposed to the viewpoint 10. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.

FIGS. 8A-8C depict the steps to be taken to present a green display to the viewpoint 10. As shown in FIG. 8A, the particles 52, 54, 56 are initially distributed randomly in the capsule 20. All the particles 52, 54, 56 are attracted to the side of the capsule 20 proximal the viewpoint 10 by applying an electric field in one direction. The electric field should be applied to the capsule 20 long enough to attract even the more slowly moving green particles 56 to the electrode 32. As shown in FIG. 8C, the electric field is reversed just long enough to allow the red particles 52 and the blue particles 54 to migrate towards the electrode 54, leaving the slowly-moving green particles 56 displayed to the viewpoint. The amount of time for which the applied electric field must be reversed can be determined from the relative electrophoretic mobilities of the particles, the strength of the applied electric field, and the size of the capsule.

In other embodiments, the capsule contains multiple species of particles and a dyed dispersing fluid that acts as one of the colors. In still other embodiments, more than three species of particles may be provided having additional colors. In one of these embodiments, the capsule contains white particles which have a strong positive charge, cyan particles which have a weakly positive charge, and red particles having a negative charge. Since the electrophoretic mobilities of these types of particles will be proportional to charge and of a direction related to the sign or polarity of the charge, these three types of particles will have different mobilities in the same voltage field. In this example, white is achieved when the top electrode is negative and the bottom electrode is positive. Red is achieved when the top electrode is positive and the bottom electrode is negative. Cyan is achieved by first setting the sub-pixel to white and then briefly reversing the voltage field so that the higher mobility white particles migrate past the cyan particles and the lower mobility, or slower, cyan particles remain topmost and visible. Although FIGS. 6-8C depict two electrodes associated with a single capsule, the electrodes may address multiple capsules or less than a full capsule.

The addressing structures described in FIGS. 1-8 typically comprise a top electrode controlled by display driver circuitry. It may be seen that if the top electrode is absent, the display may be imaged by an externally applied voltage source, such as a passing stylus or electrostatic print head. The means that techniques applied above to generate a full-color electrophoretic display could also be applied for a full-color electrophoretic media.

In FIG. 9, the rear electrode structure can be made entirely of printed layers. A conductive layer 166 can be printed onto the back of a display comprised of a clear, front electrode 168 and a printable display material 170. A clear electrode may be fabricated from indium tin oxide or conductive polymers such as polyanilines and polythiophenes. A dielectric coating 176 can be printed leaving areas for vias. Then, the back layer of conductive ink 178 can be printed. If necessary, an additional layer of conductive ink can be used before the final ink structure is printed to fill in the holes.

This technique for printing displays can be used to build the rear electrode structure on a display or to construct two separate layers that are laminated together to form the display. For example an electronically active ink may be printed on an indium tin oxide electrode. Separately, a rear electrode structure as described above can be printed on a suitable substrate, such as plastic, polymer films, or glass. The electrode structure and the display element can be laminated to form a display.

Referring now to FIG. 10, a threshold may be introduced into an electrophoretic display cell by the introduction of a third electrode. One side of the cell is a continuous, transparent electrode 200 (anode). On the other side of the cell, the transparent electrode is patterned into a set of isolated column electrode strips 210. An insulator 212 covers the column electrodes 210, and an electrode layer on top of the insulator is divided into a set of isolated row electrode strips 230, which are oriented orthogonal to the column electrodes 210. The row electrodes 230 are patterned into a dense array of holes, or a grid, beneath which the exposed insulator 212 has been removed, forming a multiplicity of physical and potential wells.

A positively charged particle 50 is loaded into the potential wells by applying a positive potential (e.g. 30V) to all the column electrodes 210 while keeping the row electrodes 230 at a less positive potential (e.g. 15V) and the anode 200 at zero volts. The particle 50 may be a conformable capsule that situates itself into the physical wells of the control grid. The control grid itself may have a rectangular cross-section, or the grid structure may be triangular in profile. It can also be a different shape which encourages the microcapsules to situate in the grid, for example, hemispherical.

The anode 200 is then reset to a positive potential (e.g. 50V). The particle will remain in the potential wells due to the potential difference in the potential wells: this is called the Hold condition. To address a display element the potential on the column electrode associated with that element is reduced, e.g. by a factor of two, and the potential on the row electrode associated with that element is made equal to or greater than the potential on the column electrode. The particles in this element will then be transported by the electric field due to the positive voltage on the anode 200. The potential difference between row and column electrodes for the remaining display elements is now less than half of that in the normal Hold condition. The geometry of the potential well structure and voltage levels are chosen such that this also constitutes a Hold condition, i.e., no particles will leave these other display elements and hence there will be no half-select problems. This addressing method can select and write any desired element in a matrix without affecting the pigment in any other display element. A control electrode device can be operated such that the anode electrode side of the cell is viewed.

The control grid may be manufactured through any of the processes known in the art, or by several novel processes described herein. That is, according to traditional practices, the control grid may be constructed with one or more steps of photolithography and subsequent etching, or the control grid may be fabricated with a mask and a “sandblasting” technique.

In another embodiment, the control grid is fabricated by an embossing technique on a plastic substrate. The grid electrodes may be deposited by vacuum deposition or sputtering, either before or after the embossing step. In another embodiment, the electrodes are printed onto the grid structure after it is formed, the electrodes consisting of some kind of printable conductive material which need not be clear (e.g. a metal or carbon-doped polymer, an intrinsically conducting polymer, etc.).

In a preferred embodiment, the control grid is fabricated with a series of printing steps. The grid structure is built up in a series of one or more printed layers after the cathode has been deposited, and the grid electrode is printed onto the grid structure. There may be additional insulator on top of the grid electrode, and there may be multiple grid electrodes separated by insulator in the grid structure. The grid electrode may not occupy the entire width of the grid structure, and may only occupy a central region of the structure, in order to stay within reproducible tolerances. In another embodiment, the control grid is fabricated by photoetching away a glass, such as a photostructural glass.

In an encapsulated electrophoretic image display, an electrophoretic suspension, such as the ones described previously, is placed inside discrete compartments that are dispersed in a polymer matrix. This resulting material is highly susceptible to an electric field across the thickness of the film. Such a field is normally applied using electrodes attached to either side of the material. However, as described above in connection with FIGS. 3A-3F, some display media may be addressed by writing electrostatic charge onto one side of the display material. The other side normally has a clear or opaque electrode. For example, a sheet of encapsulated electrophoretic display media can be addressed with a head providing DC voltages.

In another embodiment, the encapsulated electrophoretic suspension can be printed onto an area of a conductive material such as a printed silver or graphite ink, aluminized mylar, or any other conductive surface. This surface which constitutes one electrode of the display can be set at ground or high voltage. An electrostatic head consisting of many electrodes can be passed over the capsules to addressing them. Alternatively, a stylus can be used to address the encapsulated electrophoretic suspension.

In another embodiment, an electrostatic write head is passed over the surface of the material. This allows very high resolution addressing. Since encapsulated electrophoretic material can be placed on plastic, it is flexible. This allows the material to be passed through normal paper handling equipment. Such a system works much like a photocopier, but with no consumables. The sheet of display material passes through the machine and an electrostatic or electrophotographic head addresses the sheet of material.

In another embodiment, electrical charge is built up on the surface of the encapsulated display material or on a dielectric sheet through frictional or triboelectric charging. The charge can built up using an electrode that is later removed. In another embodiment, charge is built up on the surface of the encapsulated display by using a sheet of piezoelectric material.

Microencapsulated displays offer a useful means of creating electronic displays, many of which can be coated or printed. There are many versions of microencapsulated displays, including microencapsulated electrophoretic displays. These displays can be made to be highly reflective, bistable, and low power.

To obtain high resolution displays, it is useful to use some external addressing means with the microencapsulated material. This invention describes useful combinations of addressing means with microencapsulated electrophoretic materials in order to obtain high resolution displays.

One method of addressing liquid crystal displays is the use of silicon-based thin film transistors to form an addressing backplane for the liquid crystal. For liquid crystal displays, these thin film transistors are typically deposited on glass, and are typically made from amorphous silicon or polysilicon. Other electronic circuits (such as drive electronics or logic) are sometimes integrated into the periphery of the display. An emerging field is the deposition of amorphous or polysilicon devices onto flexible substrates such as metal foils or plastic films.

The addressing electronic backplane could incorporate diodes as the nonlinear element, rather than transistors. Diode-based active matrix arrays have been demonstrated as being compatible with liquid crystal displays to form high resolution devices.

There are also examples of crystalline silicon transistors being used on glass substrates. Crystalline silicon possesses very high mobilities, and thus can be used to make high performance devices. Presently, the most straightforward way of constructing crystalline silicon devices is on a silicon wafer. For use in many types of liquid crystal displays, the crystalline silicon circuit is constructed on a silicon wafer, and then transferred to a glass substrate by a “liftoff” process. Alternatively, the silicon transistors can be formed on a silicon wafer, removed via a liftoff process, and then deposited on a flexible substrate such as plastic, metal foil, or paper. As another embodiment, the silicon could be formed on a different substrate that is able to tolerate high temperatures (such as glass or metal foils), lifted off, and transferred to a flexible substrate. As yet another embodiment, the silicon transistors are formed on a silicon wafer, which is then used in whole or in part as one of the substrates for the display.

The use of silicon-based circuits with liquid crystals is the basis of a large industry. Nevertheless, these display possess serious drawbacks. Liquid crystal displays are inefficient with light, so that most liquid crystal displays require some sort of backlighting. Reflective liquid crystal displays can be constructed, but are typically very dim, due to the presence of polarizers. Most liquid crystal devices require precise spacing of the cell gap, so that they are not very compatible with flexible substrates. Most liquid crystal displays require a “rubbing” process to align the liquid crystals, which is both difficult to control and has the potential for damaging the TFT array.

The combination of these thin film transistors with microencapsulated electrophoretic displays should be even more advantageous than with liquid crystal displays. Thin film transistor arrays similar to those used with liquid crystals could also be used with the microencapsulated display medium. As noted above, liquid crystal arrays typically requires a “rubbing” process to align the liquid crystals, which can cause either mechanical or static electrical damage to the transistor array. No such rubbing is needed for microencapsulated displays, improving yields and simplifying the construction process.

Microencapsulated electrophoretic displays can be highly reflective. This provides an advantage in high-resolution displays, as a backlight is not required for good visibility. Also, a high-resolution display can be built on opaque substrates, which opens up a range of new materials for the deposition of thin film transistor arrays.

Moreover, the encapsulated electrophoretic display is highly compatible with flexible substrates. This enables high-resolution TFT displays in which the transistors are deposited on flexible substrates like flexible glass, plastics, or metal foils. The flexible substrate used with any type of thin film transistor or other nonlinear element need not be a single sheet of glass, plastic, metal foil, though. Instead, it could be constructed of paper. Alternatively, it could be constructed of a woven material. Alternatively, it could be a composite or layered combination of these materials.

As in liquid crystal displays, external logic or drive circuitry can be built on the same substrate as the thin film transistor switches.

In another embodiment, the addressing electronic backplane could incorporate diodes as the nonlinear element, rather than transistors.

In another embodiment, it is possible to form transistors on a silicon wafer, dice the transistors, and place them in a large area array to form a large, TFT-addressed display medium. One example of this concept is to form mechanical impressions in the receiving substrate, and then cover the substrate with a slurry or other form of the transistors. With agitation, the transistors will fall into the impressions, where they can be bonded and incorporated into the device circuitry. The receiving substrate could be glass, plastic, or other nonconductive material. In this way, the economy of creating transistors using standard processing methods can be used to create large-area displays without the need for large area silicon processing equipment.

While the examples described here are listed using encapsulated electrophoretic displays, there are other particle-based display media which should also work as well, including encapsulated suspended particles and rotating ball displays.

While the invention has been particularly shown and described with reference to specific preferred embodiments, it should be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Wilcox, Russell J., Drzaic, Paul

Patent Priority Assignee Title
10036930, Nov 14 2007 E Ink Corporation Electro-optic assemblies, and adhesives and binders for use therein
10036931, Jan 14 2014 E Ink Corporation Color display device
10040954, May 28 2015 E Ink Corporation Electrophoretic medium comprising a mixture of charge control agents
10062337, Oct 12 2015 E Ink Corporation Electrophoretic display device
10087344, Oct 30 2015 E Ink Corporation Methods for sealing microcell containers with phenethylamine mixtures
10147366, Nov 17 2014 E Ink Corporation Methods for driving four particle electrophoretic display
10151955, Jan 17 2014 E Ink Corporation Controlled polymeric material conductivity for use in a two-phase electrode layer
10162242, Oct 11 2013 E Ink Corporation Color display device
10175550, Nov 07 2014 E Ink Corporation Applications of electro-optic displays
10196523, Nov 11 2015 E Ink Corporation Functionalized quinacridone pigments
10233339, May 28 2015 E Ink Corporation Electrophoretic medium comprising a mixture of charge control agents
10234742, Jan 14 2014 E Ink Corporation Color display device
10242630, May 14 2013 E Ink Corporation Color electrophoretic displays using same polarity reversing address pulse
10254619, May 17 2013 E Ink Corporation Driving methods for color display devices
10254620, Mar 08 2016 E Ink Corporation Encapsulated photoelectrophoretic display
10261370, Oct 05 2011 Apple Inc.; Apple Inc Displays with minimized border regions having an apertured TFT layer for signal conductors
10270939, May 24 2016 E Ink Corporation Method for rendering color images
10276109, Mar 09 2016 E Ink Corporation Method for driving electro-optic displays
10319314, Jun 13 2002 E Ink Corporation Methods for driving electro-optic displays, and apparatus for use therein
10324354, Nov 05 2003 E Ink Corporation Electro-optic displays, and materials for use therein
10331005, Oct 16 2002 E Ink Corporation Electrophoretic displays
10332435, Oct 02 2012 E Ink Corporation Color display device
10380955, Jul 09 2014 E Ink Corporation Color display device and driving methods therefor
10431168, Nov 17 2014 E Ink Corporation Methods for driving four particle electrophoretic display
10444590, Sep 03 2002 E Ink Corporation Electro-optic displays
10444591, Mar 22 2006 E Ink Corporation Electro-optic media produced using ink jet printing
10444592, Mar 09 2017 E Ink Corporation Methods and systems for transforming RGB image data to a reduced color set for electro-optic displays
10467984, Mar 06 2017 E Ink Corporation Method for rendering color images
10475399, May 14 2013 E Ink Corporation Color electrophoretic displays using same polarity reversing address pulse
10509293, Sep 10 2014 E Ink Corporation Colored electrophoretic displays
10514583, Jan 31 2011 E Ink Corporation Color electrophoretic display
10522072, Oct 28 2011 Apple Inc. Display with vias for concealed printed circuit and component attachment
10527880, Jun 28 2007 E Ink Corporation Process for the production of electro-optic displays, and color filters for use therein
10554854, May 24 2016 E Ink Corporation Method for rendering color images
10573257, May 30 2017 E Ink Corporation Electro-optic displays
10586499, Nov 17 2014 E Ink Corporation Electrophoretic display including four particles with different charges and optical characteristics
10593272, Mar 09 2016 E Ink Corporation Drivers providing DC-balanced refresh sequences for color electrophoretic displays
10599005, Sep 03 2002 E Ink Corporation Electro-optic displays
10620490, Oct 05 2011 Apple Inc. Displays with minimized border regions having an apertured TFT or other layer for signal conductors
10657869, Sep 10 2014 E Ink Corporation Methods for driving color electrophoretic displays
10662334, Nov 11 2015 E Ink Corporation Method of making functionalized quinacridone pigments
10678111, Sep 10 2014 E Ink Corporation Colored electrophoretic displays
10726798, Mar 31 2003 E Ink Corporation Methods for operating electro-optic displays
10771652, May 24 2016 E Ink Corporation Method for rendering color images
10782586, Jan 20 2017 E Ink Corporation Color organic pigments and electrophoretic display media containing the same
10793750, Oct 30 2015 E Ink Corporation Methods for sealing microcell containers with phenethylamine mixtures
10795221, Jan 17 2014 E Ink Corporation Methods for making two-phase light-transmissive electrode layer with controlled conductivity
10825405, May 30 2017 E Ink Corporatior Electro-optic displays
10877332, Oct 05 2011 Apple Inc. Displays with minimized border regions having an apertured TFT layer for signal conductors
10891906, Jul 09 2014 E Ink Corporation Color display device and driving methods therefor
10891907, Nov 17 2014 E Ink Corporation Electrophoretic display including four particles with different charges and optical characteristics
10901287, May 17 2013 E Ink Corporation Driving methods for color display devices
10976634, Nov 07 2014 E Ink Corporation Applications of electro-optic displays
11017705, Oct 02 2012 E Ink Corporation Color display device including multiple pixels for driving three-particle electrophoretic media
11029576, May 21 2010 E Ink Corporation Method for driving two layer variable transmission display
11030965, Mar 09 2016 E Ink Corporation Drivers providing DC-balanced refresh sequences for color electrophoretic displays
11079651, Dec 15 2017 E Ink Corporation Multi-color electro-optic media
11084935, Nov 11 2015 E Ink Corporation Method of making functionalized quinacridone pigments
11087644, Aug 19 2015 E Ink Corporation Displays intended for use in architectural applications
11094288, Mar 06 2017 E Ink Corporation Method and apparatus for rendering color images
11098206, Oct 06 2015 E Ink Corporation Electrophoretic media including charge control agents comprising quartenary amines and unsaturated polymeric tails
11099452, Jan 20 2017 E Ink Corporation Color organic pigments and electrophoretic display media containing the same
11107425, May 30 2017 E Ink Corporation Electro-optic displays with resistors for discharging remnant charges
11137648, Oct 05 2011 Apple Inc. Displays with minimized border regions having an apertured TFT layer for signal conductors
11143929, Mar 09 2018 E Ink Corporation Reflective electrophoretic displays including photo-luminescent material and color filter arrays
11195481, May 14 2013 E Ink Corporation Color electrophoretic displays using same polarity reversing address pulse
11248122, Dec 30 2017 E Ink Corporation Pigments for electrophoretic displays
11250794, Jul 27 2004 E Ink Corporation Methods for driving electrophoretic displays using dielectrophoretic forces
11265443, May 24 2016 E Ink Corporation System for rendering color images
11266832, Nov 14 2017 E Ink Corporation Electrophoretic active delivery system including porous conductive electrode layer
11287718, Aug 04 2015 E Ink Corporation Reusable display addressable with incident light
11294255, Jun 10 2002 E Ink Corporation Components and methods for use in electro-optic displays
11315505, Jul 09 2014 E Ink Corporation Color display device and driving methods therefor
11422427, Dec 19 2017 E Ink Corporation Applications of electro-optic displays
11460165, Apr 20 2012 E Ink Corporation Illumination systems for reflective displays
11460722, May 10 2019 E Ink Corporation Colored electrophoretic displays
11467466, Apr 20 2012 E Ink Corporation Illumination systems for reflective displays
11468855, Sep 10 2014 E Ink Corporation Colored electrophoretic displays
11493820, Jan 20 2017 E Ink Corporation Color organic pigments and electrophoretic display media containing the same
11520179, Sep 03 2002 E Ink Corporation Method of forming an electrophoretic display having a color filter array
11640803, Sep 06 2021 E Ink Corporation Method for driving electrophoretic display device
11733580, May 21 2010 E Ink Corporation Method for driving two layer variable transmission display
11804190, Sep 06 2021 E Ink Corporation Method for driving electrophoretic display device
11868020, Jun 05 2020 E Ink Corporation Electrophoretic display device
11869451, Nov 05 2021 E Ink Corporation Multi-primary display mask-based dithering with low blooming sensitivity
11922893, Dec 22 2021 E Ink Corporation High voltage driving using top plane switching with zero voltage frames between driving frames
11938214, Nov 27 2019 E Ink Corporation Benefit agent delivery system comprising microcells having an electrically eroding sealing layer
11938215, Nov 27 2019 E Ink Corporation Method for operating a benefit agent delivery system comprising microcells having an electrically eroding sealing layer
8649084, Sep 02 2011 E Ink Corporation Color display devices
8797634, Nov 30 2010 E Ink Corporation Multi-color electrophoretic displays
8873129, Apr 07 2011 E Ink Corporation Tetrachromatic color filter array for reflective display
8902153, Aug 03 2007 E Ink Corporation Electro-optic displays, and processes for their production
8976444, Sep 02 2011 E Ink Corporation Color display devices
9013783, Jun 02 2011 E Ink Corporation Color electrophoretic display
9116412, May 26 2010 E Ink Corporation Color display architecture and driving methods
9170468, May 17 2013 E Ink Corporation Color display device
9195111, Feb 11 2013 E Ink Corporation Patterned electro-optic displays and processes for the production thereof
9269311, Nov 20 2001 E Ink Corporation Methods and apparatus for driving electro-optic displays
9285649, Apr 18 2013 E Ink Corporation Color display device
9286826, Oct 28 2011 Apple Inc. Display with vias for concealed printed circuit and component attachment
9310661, Mar 06 2007 E Ink Corporation Materials for use in electrophoretic displays
9341916, May 21 2010 E Ink Corporation Multi-color electro-optic displays
9360733, Oct 02 2012 E Ink Corporation Color display device
9361836, Dec 20 2013 E Ink Corporation Aggregate particles for use in electrophoretic color displays
9412314, Nov 20 2001 E Ink Corporation Methods for driving electro-optic displays
9436056, Feb 06 2013 E Ink Corporation Color electro-optic displays
9454025, Aug 31 2012 Apple Inc Displays with reduced driver circuit ledges
9459510, May 17 2013 E Ink Corporation Color display device with color filters
9470950, Jun 10 2002 E Ink Corporation Electro-optic displays, and processes for the production thereof
9513527, Jan 14 2014 E Ink Corporation Color display device
9515131, Aug 17 2012 Apple Inc. Narrow border organic light-emitting diode display
9529240, Jan 17 2014 E Ink Corporation Controlled polymeric material conductivity for use in a two-phase electrode layer
9530363, Nov 20 2001 E Ink Corporation Methods and apparatus for driving electro-optic displays
9541814, Feb 19 2014 E Ink Corporation Color display device
9552780, Dec 20 2013 E Ink Corporation Aggregate particles for use in electrophoretic color displays
9554495, Jun 29 2007 SAMSUNG ELECTRONICS CO , LTD Electro-optic displays, and materials and methods for production thereof
9612502, Jun 10 2002 E Ink Corporation Electro-optic display with edge seal
9620067, Mar 31 2003 E Ink Corporation Methods for driving electro-optic displays
9646547, May 17 2013 E Ink Corporation Color display device
9697778, May 14 2013 E Ink Corporation Reverse driving pulses in electrophoretic displays
9726959, Oct 18 2005 E Ink Corporation Color electro-optic displays, and processes for the production thereof
9752034, Nov 11 2015 E Ink Corporation Functionalized quinacridone pigments
9759981, Mar 18 2014 E Ink Corporation Color display device
9761181, Jul 09 2014 E Ink Corporation Color display device
9778538, Dec 20 2013 E Ink Corporation Aggregate particles for use in electrophoretic color displays
9780159, Aug 17 2012 Apple Inc. Narrow border organic light-emitting diode display
9805643, Oct 28 2011 Apple Inc. Display with vias for concealed printed circuit and component attachment
9829764, Dec 05 2003 E Ink Corporation Multi-color electrophoretic displays
9841653, Mar 06 2007 E Ink Corporation Materials for use in electrophoretic displays
9886886, Nov 20 2001 E Ink Corporation Methods for driving electro-optic displays
9910337, Mar 22 2006 E Ink Corporation Electro-optic media produced using ink jet printing
9921422, Jun 10 2002 E Ink Corporation Electro-optic display with edge seal
9921451, Sep 10 2014 E Ink Corporation Colored electrophoretic displays
9922603, Jul 09 2014 E Ink Corporation Color display device and driving methods therefor
9964831, Nov 14 2007 E Ink Corporation Electro-optic assemblies, and adhesives and binders for use therein
9974122, Jun 25 2012 Apple Inc. Displays with vias
9989829, May 21 2010 E Ink Corporation Multi-color electro-optic displays
9997578, Aug 31 2012 Apple Inc. Displays with reduced driver circuit ledges
ER585,
Patent Priority Assignee Title
2766478,
3036388,
3384488,
3389194,
3406363,
3423489,
3460248,
3585381,
3612758,
3617374,
3668106,
3670323,
3756693,
3767392,
3772013,
3792308,
3850627,
3870517,
3892568,
3909116,
3936816, Nov 02 1972 Dai Nippon Toryo Kabushiki Kaisha Flat display system
3959906, Aug 10 1972 J. Robert, Norris, Jr.; Noa, Wasserman Message display system
3972040, Aug 12 1974 The Secretary of State for Defence in Her Britannic Majesty's Government Display systems
4041481, Oct 05 1974 Matsushita Electric Industrial Co., Ltd. Scanning apparatus for an electrophoretic matrix display panel
4045327, Aug 28 1974 Matsushita Electric Industrial Co., Ltd. Electrophoretic matrix panel
4056708, Jul 22 1975 TECHNICON INSTRUMENTS CORPORATION, 511 BENEDICT AVENUE, TARRYTOWN, NEW YORK 10591-6097, A CORP OF DE Digital temperature controller
4062009, Jul 17 1975 Thomson-CSF Electrophoretic display device
4068927, Sep 01 1976 North American Philips Corporation Electrophoresis display with buried lead lines
4071430, Dec 06 1976 North American Philips Corporation Electrophoretic image display having an improved switching time
4088395, May 27 1976 American Cyanamid Company Paper counter-electrode for electrochromic devices
4093534, Feb 12 1974 Plessey Overseas Limited Working fluids for electrophoretic image display devices
4104520, May 24 1977 Xonics, Inc. Image charge relaxation in electrophoretic displays
4123206, Feb 07 1977 Eastman Chemical Company Encapsulating apparatus
4123346, May 11 1976 Thomson-CSF Electrophoretic device
4126528, Jul 26 1977 Xerox Corporation Electrophoretic composition and display device
4126854, May 05 1976 Xerox Corporation Twisting ball panel display
4143103, May 04 1976 Xerox Corporation Method of making a twisting ball panel display
4143472, Apr 11 1977 PILOT CORPORATION OF AMERICA Displaying magnetic panel and its display device
4147932, Sep 06 1977 Elscint, Limited; ELSCINT IMAGING, INC Low light level and infrared viewing system
4149149, Feb 20 1976 Hitachi, Ltd. Circuit for actuating a display with an improved comparator
4185621, Oct 28 1977 Triad, Inc. Body parameter display incorporating a battery charger
4196437, Feb 05 1976 Method and apparatus for forming a compound liquid jet particularly suited for ink-jet printing
4203106, Nov 23 1977 North American Philips Corporation X-Y addressable electrophoretic display device with control electrode
4218302, Aug 02 1979 U.S. Philips Corporation Electrophoretic display devices
4231641, Nov 29 1975 ETS S A , A SWISS CORP Electro-optic device
4251747, Nov 15 1979 NORTH AMERICAN PHILIPS CONSUMER ELECTRONICS CORP One piece astigmatic grid for color picture tube electron gun
4261653, May 26 1978 The Bendix Corporation Light valve including dipolar particle construction and method of manufacture
4272596, Jun 01 1979 Xerox Corporation Electrophoretic display device
4279632, May 08 1979 Method and apparatus for producing concentric hollow spheres
4285801, Sep 20 1979 Xerox Corporation Electrophoretic display composition
4298448, Feb 02 1979 BBC Brown, Boveri & Company, Limited Electrophoretic display
4301407, Oct 26 1978 Siemens Aktiengesellschaft Hand held testing device for indicating an electric test voltage
4303433, Aug 28 1978 DORT, DALLAS W Centrifuge apparatus and method for producing hollow microspheres
4305807, Mar 13 1980 Unisys Corporation Electrophoretic display device using a liquid crystal as a threshold device
4311361, Mar 13 1980 Unisys Corporation Electrophoretic display using a non-Newtonian fluid as a threshold device
4314013, Apr 04 1979 Xerox Corporation Particle formation by double encapsulation
4324456, Aug 02 1979 U.S. Philips Corporation Electrophoretic projection display systems
4336536, Dec 17 1979 Reflective display and method of making same
4345249, Dec 25 1979 Citizen Watch Company Limited Liquid crystal display panel
4368952, Dec 11 1979 Pilot Man-Nen-Hitsu Kabushiki Kaisha Magnetic display panel using reversal magnetism
4373282, Dec 26 1979 Hughes Aircraft Company Thin-panel illuminator for front-lit displays
4390403, Jul 24 1981 Method and apparatus for dielectrophoretic manipulation of chemical species
4418346, May 20 1981 Method and apparatus for providing a dielectrophoretic display of visual information
4430648, Jan 22 1980 Citizen Watch Company Limited Combination matrix array display and memory system
4435047, Sep 16 1981 Manchester R&D Limited Partnership Encapsulated liquid crystal and method
4438160, Jan 18 1982 Sony Corporation Method of making a rotary ball display device
4450440, Dec 24 1981 U.S. Philips Corporation Construction of an epid bar graph
4453200, Jul 20 1981 Rockwell International Corporation Apparatus for lighting a passive display
4500880, Jul 06 1981 Motorola, Inc. Real time, computer-driven retail pricing display system
4502934, Jun 01 1982 Thomson-CSF Electrode comprising an electrochrome polymer film and a display device using such an electrode
4509828, Feb 05 1981 COMMISSARIAT A L ENERGIE ATOMIQUE Matrix display device with multiple screen electrodes
4522472, Feb 19 1982 North American Philips Corporation Electrophoretic image display with reduced drives and leads
4544834, Mar 04 1981 Johnson Matthey Public Limited Company Memory device
4598960, Apr 29 1985 AU Optronics Corporation Methods and apparatus for connecting closely spaced large conductor arrays employing multi-conductor carrier boards
4605284, Mar 21 1983 Manchester R&D Limited Partnership Encapsulated liquid crystal and method
4606611, Sep 16 1981 Manchester R&D Limited Partnership Enhanced scattering in voltage sensitive encapsulated liquid crystal
4616903, Sep 16 1981 Manchester R&D Limited Partnership Encapsulated liquid crystal and method
4620916, Sep 19 1985 EPID, INC Degradation retardants for electrophoretic display devices
4640583, Jul 22 1983 Epson Corporation Display panel having an inner and an outer seal and process for the production thereof
4643528, Mar 18 1985 Manchester R&D Limited Partnership Encapsulated liquid crystal and filler material
4648956, Dec 31 1984 North American Philips Corporation Electrode configurations for an electrophoretic display device
4655897, Nov 13 1984 AU Optronics Corporation Electrophoretic display panels and associated methods
4684219, Feb 01 1985 International Business Machines Corporation Display cell with self-sealing, collapsing plug
4686524, Nov 04 1985 North American Philips Corporation Photosensitive electrophoretic displays
4700183, Jun 29 1981 North American Philips Corporation Format for improving the readability of numeric displays
4703573, Feb 04 1985 AUGUSTA HOLDINGS, LLC Visual and audible activated work and method of forming same
4707080, Sep 16 1981 Manchester R&D Limited Partnership Encapsulated liquid crystal material, apparatus and method
4707593, May 23 1986 KABUSHIKI KAISHA PILOT CORPORATION ALSO TRADING AS PILOT CORPORATION Visible image magnetic card
4726662, Sep 24 1985 TYCO ELECTRONICS CORPORATION, A CORPORATION OF PENNSYLVANIA Display including a prismatic lens system or a prismatic reflective system
4730186, Apr 20 1984 Hitachi, LTD Input integrated flat panel display system
4732456, Aug 28 1984 Raychem Corporation Scattering display for contrast enhancement including target
4732830, Nov 13 1984 AU Optronics Corporation Electrophoretic display panels and associated methods
4741601, Oct 08 1984 NEC Corporation Non-linear device for driving liquid crystal display
4741604, Feb 01 1985 Electrode arrays for cellular displays
4742345, Nov 19 1985 AU Optronics Corporation Electrophoretic display panel apparatus and methods therefor
4746917, Jul 14 1986 AU Optronics Corporation Method and apparatus for operating an electrophoretic display between a display and a non-display mode
4748366, Sep 02 1986 Ocean Power Technologies, INC Novel uses of piezoelectric materials for creating optical effects
4772102, May 18 1987 Raychem Corporation Display with light traps between reflector and scattering means
4772820, Sep 11 1986 AU Optronics Corporation Monolithic flat panel display apparatus
4776675, Jun 18 1984 NISSHA PRINTING CO , LTD , 3, MIBU HANAI-CHO, NAKAGYO-KU, KYOTO-SHI, KYOTO 604 JAPAN Multicolor liquid crystal display device having printed color filters
4789858, Jun 12 1984 TYCO ELECTRONICS CORPORATION, A CORPORATION OF PENNSYLVANIA Multifunction switch incorporating NCAP liquid crystal
4794390, Mar 10 1986 ZUKERMAN, HAROLD W ; ZUKERMAN, RACHEL B Alphanumeric display means
4821291, Sep 22 1986 AMACRINE INTERNATIONAL, INC Improvements in or relating to signal communication systems
4824208, Aug 28 1984 Raychem Corporation Display for contrast enhancement
4832458, Aug 28 1984 Raychem Corporation Display for contrast enhancement
4833464, Sep 14 1987 AU Optronics Corporation Electrophoretic information display (EPID) apparatus employing grey scale capability
4850919, Sep 11 1986 AU Optronics Corporation Monolithic flat panel display apparatus and methods for fabrication thereof
4870677, Sep 04 1987 AU Optronics Corporation Data/facsimile telephone subset apparatus incorporating electrophoretic displays
4888140, Feb 11 1987 CHESEBROUGH-POND S INC , WESTPORT, CT A CORP OF NY Method of forming fluid filled microcapsules
4889603, Dec 09 1988 AU Optronics Corporation Method of eliminating gas bubbles in an electrophoretic display
4891245, Mar 21 1986 Koh-I-Noor Rapidograph, Inc. Electrophoretic display particles and a process for their preparation
4892607, Dec 04 1986 AU Optronics Corporation Chip mounting techniques for display apparatus
4909959, Apr 01 1986 Solvay & Cie (Societe Anonyme) Conductive polymers derived from 3-alkylthiophenes, a process for manufacturing them and electroconductive devices containing them
4919521, Jun 03 1987 Nippon Sheet Glass Co., Ltd. Electromagnetic device
4931019, Sep 01 1988 ATOCHEM NORTH AMERICA, INC , A PA CORP Electrostatic image display apparatus
4937586, Sep 22 1986 AMACRINE INTERNATIONAL, INC Radio broadcast communication systems with multiple loop antennas
4947157, Oct 03 1988 AU Optronics Corporation Apparatus and methods for pulsing the electrodes of an electrophoretic display for achieving faster display operation
4947159, Apr 18 1988 AU Optronics Corporation Power supply apparatus capable of multi-mode operation for an electrophoretic display panel
4947219, Jan 06 1987 BP SOLAR, INC Particulate semiconductor devices and methods
4948232, Dec 16 1983 Device for the presentation of information with rollable plastic substrate
4949081, Jul 07 1986 U S PHILIPS CORPORATION, 100 EAST 42ND STREET, NEW YORK, NY 10017, A CORP OF DE Data display device
4960351, Apr 26 1982 California Institute of Technology Shell forming system
4962466, Mar 27 1987 Pricer AB Electronic product information display system
5006212, Mar 10 1988 AU Optronics Corporation Methods enabling stress crack free patterning of chrome on layers of organic polymers
5006422, Aug 06 1987 The Nippon Signal Co., Ltd. Visual magnetic recording medium and method of making the same
5009490, Nov 11 1988 Pioneer Electronic Corp. Photo-conductive liquid crystal light valve
5016002, Apr 15 1988 SPYDER NAVIGATIONS L L C Matrix display
5017225, Dec 02 1987 Japan Capsular Products Inc.; Mitsubishi Kasei Corporation Microencapsulated photochromic material, process for its preparation and a water-base ink composition prepared therefrom
5028841, Jul 18 1989 AU Optronics Corporation Chip mounting techniques for display apparatus
5040960, Feb 13 1986 Snow Brand Milk Products Co., Ltd. Apparatus for preparing encapsulated bodies
5041824, Mar 02 1989 AU Optronics Corporation Semitransparent electrophoretic information displays (EPID) employing mesh like electrodes
5042917, Apr 25 1986 Matsushita Electric Industrial Co., Ltd. Liquid crystal matrix display unit
5053763, May 01 1989 AU Optronics Corporation Dual anode flat panel electrophoretic display apparatus
5057363, Dec 27 1989 TOMY COMPANY, LTD; JAPAN CAPSULAR PRODUCTS, INC Magnetic display system
5066105, Oct 18 1989 Ube Industries, Ltd. Liquid crystal display device having varistor layers substantially free from cross-talk
5066946, Jul 03 1989 AU Optronics Corporation Electrophoretic display panel with selective line erasure
5067021, Jul 21 1988 SAMSUNG ELECTRONICS CO , LTD Modular flat-screen television displays and modules and circuit drives therefor
5070326, Apr 13 1988 Ube Industries Ltd. Liquid crystal display device
5077157, Nov 24 1989 AU Optronics Corporation Methods of fabricating dual anode, flat panel electrophoretic displays
5082351, Sep 16 1981 Manchester R&D Limited Partnership Encapsulated liquid crystal material, apparatus and method
5105185, Jul 12 1989 ALPS Electric Co., Ltd. Display method, device for realizing same and displaying medium used therefor
5128785, Aug 08 1989 Ube Industries, Ltd. Liquid crystal display device substantially free from cross-talk having varistor layers coupled to signal lines and picture electrodes
5138472, Feb 11 1991 TYCO ELECTRONICS CORPORATION, A CORPORATION OF PENNSYLVANIA Display having light scattering centers
5148002, Mar 14 1991 Multi-functional garment system
5151032, Jul 12 1990 PILOT CORPORATION AKA KABUSHIKI KAISHA PILOT Magnetophoretic display panel
5155607, Mar 16 1990 Fuji Xerox Co., Ltd. Optical modulation display device and display method using the same
5160371, Apr 28 1989 Sony Corporation Display composition, coloring pigment, and recording material
5161007, Apr 27 1990 Victor Company of Japan, Ltd. Recording head with carrier generation and transport layers adjacent a photo-modulation layer for recording information included in an electro-magnetic radiation-beam applied thereto
5167508, Aug 21 1989 AUGUSTA HOLDINGS LLC Electronic book
5172314, May 03 1991 ELECTRONIC RETAILING SYSTEMS INTERNATIONAL, INC Apparatus for communicating price changes including printer and display devices
5174882, Nov 25 1991 AU Optronics Corporation Electrode structure for an electrophoretic display apparatus
5175047, Aug 09 1990 Teledyne Technologies Incorporated Rigid-flex printed circuit
5177476, Nov 24 1989 AU Optronics Corporation Methods of fabricating dual anode, flat panel electrophoretic displays
5179065, Apr 28 1989 Sony Corporation Recording material with a display composition including a coloring pigment
5185226, Mar 23 1988 Olin Corporation Electrostatic method for multicolor imaging from a single toner bath comprising double-encapsulated toner particles
5187609, Mar 27 1991 AU Optronics Corporation Electrophoretic display panel with semiconductor coated elements
5194852, Dec 01 1986 Summagraphics Corporation Electro-optic slate for direct entry and display and/or storage of hand-entered textual and graphic information
5208686, Mar 01 1985 Manchester R&D Partnership Liquid crystal color display and method
5216416, Aug 19 1991 AU Optronics Corporation Electrophoretic display panel with interleaved local anode
5220316, Jul 03 1989 Nonlinear resistor control circuit and use in liquid crystal displays
5223115, May 13 1991 AU Optronics Corporation Electrophoretic display with single character erasure
5223823, Mar 11 1991 AU Optronics Corporation Electrophoretic display panel with plural electrically independent anode elements
5233459, Mar 06 1991 MASSACHUSETTS INSTITUTE OF TECHNOLOGY, A CORP OF MA Electric display device
5238861, May 15 1990 Fahrenheit Thermoscope LLC; Fahrenheit Thermoscope, LLC Method for manufacturing an active matrix display screen with storage capacitors
5247290, Nov 21 1991 AU Optronics Corporation Method of operation for reducing power, increasing life and improving performance of EPIDs
5250932, Apr 13 1988 Ube Industries, Ltd. Liquid crystal display device
5250938, Dec 19 1990 AU Optronics Corporation Electrophoretic display panel having enhanced operation
5254981, Sep 15 1989 AU Optronics Corporation Electrophoretic display employing gray scale capability utilizing area modulation
5258864, May 17 1991 U.S. Philips Corporation Method of fabricating MIM device arrays using a single exposure and lift-off process
5260002, Dec 23 1991 Vanderbilt University Method and apparatus for producing uniform polymeric spheres
5262098, Dec 23 1992 Xerox Corporation Method and apparatus for fabricating bichromal balls for a twisting ball display
5266934, Sep 28 1989 U.S. Philips Corporation Alpha-numerical display device
5266937, Nov 25 1991 AU Optronics Corporation Method for writing data to an electrophoretic display panel
5270843, Aug 31 1992 Directly formed polymer dispersed liquid crystal light shutter displays
5276438, Nov 20 1991 AU Optronics Corporation Electrophoretic display panel with internal mesh background screen
5279511, Oct 21 1992 AU Optronics Corporation Method of filling an electrophoretic display
5279694, Dec 04 1986 AU Optronics Corporation Chip mounting techniques for display apparatus
5293528, Feb 25 1992 AU Optronics Corporation Electrophoretic display panel and associated methods providing single pixel erase capability
5298833, Jun 22 1992 AU Optronics Corporation Black electrophoretic particles for an electrophoretic image display
5302235, May 01 1989 AU Optronics Corporation Dual anode flat panel electrophoretic display apparatus
5303073, Jun 24 1991 TOSHIBA MOBILE DISPLAY CO , LTD Dispersion-type liquid crystal display element with oriented dichroic dye in the support media
5304439, Aug 19 1991 AU Optronics Corporation Method of making an electrophoretic display panel with interleaved local anode
5315312, May 06 1991 AU Optronics Corporation Electrophoretic display panel with tapered grid insulators and associated methods
5344594, Oct 29 1991 Xerox Corporation Method for the fabrication of multicolored balls for a twisting ball display
5345251, Jan 11 1993 AU Optronics Corporation Electrophoretic display panel with interleaved cathode and anode
5345322, Mar 01 1985 Manchester R & D Limited Partnership Complementary color liquid crystal display
5357355, Jun 07 1991 NEC Corporation Double sided thin panel display unit for displaying the same image
5359346, Feb 25 1992 AU Optronics Corporation Electrophoretic display panel and associated methods for blinking displayed characters
5360689, May 21 1993 AU Optronics Corporation Colored polymeric dielectric particles and method of manufacture
5362671, Dec 31 1990 Kopin Corporation Method of fabricating single crystal silicon arrayed devices for display panels
5374815, Mar 15 1993 ELECTRONIC RETAILING SYSTEMS INTERNATIONAL, INC Technique for locating electronic labels in an electronic price display system
5380362, Jul 16 1993 AU Optronics Corporation Suspension for use in electrophoretic image display systems
5389945, Nov 08 1989 Xerox Corporation Writing system including paper-like digitally addressed media and addressing device therefor
5398131, Aug 13 1992 Stereoscopic hardcopy methods
5402145, Feb 17 1993 AU Optronics Corporation Electrophoretic display panel with arc driven individual pixels
5403518, Dec 02 1993 AU Optronics Corporation Formulations for improved electrophoretic display suspensions and related methods
5407231, Apr 09 1990 Productive Environments, Inc.; Productive Environments Inc Windowing leaf structure
5411398, Jun 02 1992 TOMY COMPANY, LTD; JAPAN CAPSULAR PRODUCTS, INC Magnetic display system
5411656, Aug 12 1993 AU Optronics Corporation Gas absorption additives for electrophoretic suspensions
5412398, Feb 25 1992 AU Optronics Corporation Electrophoretic display panel and associated methods for blinking displayed characters
5421926, Feb 27 1992 SUMITOMO METAL MINING CO , LTD Transparent conductive substrate and method of making the same
5430462, Dec 07 1992 Sharp Kabushiki Kaisha Image input device-integrated type display device
5450069, Sep 04 1987 AU Optronics Corporation Data/facsimile telephone subset apparatus incorporating electrophoretic displays
5459776, Sep 04 1987 AU Optronics Corporation Data/facsimile telephone subset apparatus incorporating electrophoretic displays
5460688, May 01 1989 AU Optronics Corporation Dual anode flat panel electrophoretic display apparatus
5463492, Nov 01 1991 Research Frontiers Incorporated Light modulating film of improved clarity for a light valve
5467107, Oct 01 1993 AU Optronics Corporation Electrophoretic display panel with selective character addressability
5485176, Nov 21 1991 Kabushiki Kaisha Sega Enterprises Information display system for electronically reading a book
5490005, Dec 10 1991 Robert Bosch GmbH Light sensor on a surface of a light guide for use in displays
5497171, Nov 27 1989 AEG Gesellschaft fur Moderne Informationssysteme mbH Electronic display arrangement
5498674, May 21 1993 AU Optronics Corporation Colored polymeric dielectric particles and method of manufacture
5499038, Nov 21 1991 AU Optronics Corporation Method of operation for reducing power, increasing life and improving performance of EPIDs
5500635, Feb 20 1990 Products incorporating piezoelectric material
5508068, Jun 17 1989 Shinko Electric Works Co., Ltd. Cholesteric liquid crystal composition, color-forming liquid crystal composite product, method for protecting liquid crystal and color-forming liquid crystal picture laminated product
5508720, Feb 02 1994 AU Optronics Corporation Portable telecommunication device with removable electrophoretic display
5512162, Aug 13 1992 Massachusetts Institute of Technology Method for photo-forming small shaped metal containing articles from porous precursors
5528399, Oct 29 1992 Sharp Kabushiki Kaisha Optical address type display device with uniformly functioning optical switching elements each provided for each pixel
5530567, Jun 29 1993 Casio Computer Co., Ltd. Polymer dispersed liquid crystal display device having encapsulated liquid crystal surrounded by polymer matrix liquid crystal and method of manufacturing the same
5534888, Feb 03 1994 Motorola Electronic book
5538430, Jul 26 1994 Self-reading child's book
5541478, Mar 04 1994 General Motors Corporation Active matrix vacuum fluorescent display using pixel isolation
5543219, May 08 1992 Marconi Data Systems Inc Encapsulated magnetic particles pigments and carbon black, compositions and methods related thereto
5548282, May 05 1993 Pricer AB Electronic shelf edge price display system
5561443, Feb 17 1993 AU Optronics Corporation Electrophoretic display panel with arc driven individual pixels
5565885, May 16 1990 Kabushiki Kaisha Toshiba Liquid crystal display panel and liquid crystal display device
5571741, Sep 30 1994 Elm Technology Corporation Membrane dielectric isolation IC fabrication
5573711, May 26 1994 AU Optronics Corporation Planar fluorinated dielectric suspensions for electrophoretic image displays and related methods
5574291, Dec 09 1994 Bell Semiconductor, LLC Article comprising a thin film transistor with low conductivity organic layer
5575554, May 13 1991 Multipurpose optical display for articulating surfaces
5576867, Jan 09 1990 Merck Patent Gesellschaft Mit Beschrankter Haftung Liquid crystal switching elements having a parallel electric field and βo which is not 0° or 90°
5582700, Oct 16 1995 Zikon Corporation Electrophoretic display utilizing phase separation of liquids
5583675, Apr 27 1993 Sharp Kabushiki Kaisha Liquid crystal display device and a method for producing the same
5596208, Dec 09 1994 Bell Semiconductor, LLC Article comprising an organic thin film transistor
5600172, Mar 31 1993 Board of Regents of the University of Texas System Hybrid, dye antenna/thin film superconductor devices and methods of tuned photo-responsive control thereof
5602572, Aug 25 1994 Minnesota Mining and Manufacturing Company Thinned halftone dot patterns for inkjet printing
5604027, Jan 03 1995 Xerox Corporation Some uses of microencapsulation for electric paper
5609978, Jun 06 1995 Eastman Kodak Company Method for producing an electronic image from a photographic element
5614427, Nov 19 1993 Innolux Corporation Method of making an array of TFTs having reduced parasitic capacitance
5619307, Jul 07 1994 Canon Kabushiki Kaisha Method of printing test pattern and apparatus for outputting test pattern
5625460, Dec 09 1993 Eastman Kodak Company Method and apparatus for locally switching gray dot types to reproduce an image with gray level printing
5627561, Sep 09 1993 AU Optronics Corporation Electrophoretic display panel with selective character addressability
5635317, Mar 16 1989 Dai Nippon Printing Co., Ltd. Preparation and reproduction of filters and preparation of filter photographic materials
5638103, Feb 20 1988 Dai Nippon Printing Co., Ltd. Method for recording and reproducing information, apparatus therefor and recording medium
5639914, Nov 01 1993 JOLED INC Tetraaryl benzidines
5641974, Jun 06 1995 LG DISPLAY CO , LTD LCD with bus lines overlapped by pixel electrodes and photo-imageable insulating layer therebetween
5643673, Jun 22 1992 AU Optronics Corporation Black electrophoretic particles and method of manufacture
5648801, Dec 16 1994 INFOPRINT SOLUTIONS COMPANY, LLC, A DELAWARE CORPORATION Grayscale printing system
5649266, Apr 18 1996 Eastman Kodak Company In-station calibration of toner concentration monitor and replenisher drive
5650199, Nov 22 1995 AEM COMPONENTS SUZHOU CO LTD Method of making a multilayer electronic component with inter-layer conductor connection utilizing a conductive via forming ink
5650247, Mar 16 1989 Dai Nippon Printing Co., Ltd. Preparation and reproduction of filters and preparation of filter photographic materials
5650872, Dec 08 1994 Research Frontiers Incorporated Light valve containing ultrafine particles
5663739, Dec 28 1992 MAN SYSTEMELEKTRONIC GMBH Method and arrangement for establishing networks of electro-optical display-field modules
5672381, May 15 1990 Minnesota Mining and Manufacturing Company Printing of reflective sheeting
5684501, Mar 18 1994 U.S. Philips Corporation Active matrix display device and method of driving such
5686383, May 10 1996 Global Oled Technology LLC Method of making a color filter array by colorant transfer and lamination
5689282, Sep 07 1991 U.S. Philips Corporation Display device with compensation for stray capacitance
5694224, Dec 08 1994 Eastman Kodak Company Method and apparatus for tone adjustment correction on rendering gray level image data
5699097, Apr 22 1994 Kabushiki Kaisha Toshiba Display medium and method for display therewith
5699102, Oct 15 1990 Eastman Kodak Company Non-impact copier/printer system communicating rosterized, printer independant data
5705826, Jun 28 1994 PANASONIC LIQUID CRYSTAL DISPLAY CO , LTD Field-effect transistor having a semiconductor layer made of an organic compound
5707738, Jun 22 1992 AU Optronics Corporation Black electrophoretic particles and method of manufacture
5707747, Nov 01 1993 JOLED INC Amine compound and electro-luminescence device comprising same
5708525, Dec 15 1995 Xerox Corporation Applications of a transmissive twisting ball display
5709976, Jun 03 1996 Xerox Corporation Coated papers
5714051, May 02 1995 U.S. Philips Corporation Method for depositing cathode material on a wire cathode
5715026, Sep 15 1989 U.S. Philips Corporation Method of fabricating active matrix display devices with prefabricated discrete non-linear devices
5715514, Oct 02 1996 Xerox Corporation Calibration method and system for sheet registration and deskewing
5716550, Jan 05 1996 Eastman Kodak Company Electrically conductive composition and elements containing solubilized polyaniline complex and solvent mixture
5717283, Jan 03 1996 Xerox Corporation Display sheet with a plurality of hourglass shaped capsules containing marking means responsive to external fields
5717514, Dec 15 1995 Xerox Corporation Polychromal segmented balls for a twisting ball display
5717515, Dec 15 1995 Xerox Corporation Canted electric fields for addressing a twisting ball display
5721042, Oct 16 1991 Dai Nippon Printing Co., Ltd. Electrostatic information recording medium
5722781, Jun 17 1994 Matsushita Electric Industrial Co., Ltd. Printing apparatus
5725935, Nov 07 1994 Minnesota Mining and Manufacturing Company Signage articles and methods of making same
5731116, May 17 1989 Dai Nippon Printing Co., Ltd. Electrostatic information recording medium and electrostatic information recording and reproducing method
5737115, Dec 15 1995 Xerox Corporation Additive color tristate light valve twisting ball display
5738176, Mar 22 1993 Automatic hitching system
5738716, Aug 20 1996 Eastman Kodak Company Color pigmented ink jet ink set
5738977, Apr 28 1994 U.S. Philips Corporation Method of photolithographically producing a copper pattern on a plate of an electrically insulating material
5739801, Dec 15 1995 Xerox Corporation Multithreshold addressing of a twisting ball display
5742879, Nov 16 1992 Eastman Kodak Company Method and apparatus for reproducing documents with variable information
5744283, Apr 12 1994 U S PHILIPS CORPORATION Method of photolithographically metallizing at least the inside of holes arranged in accordance with a pattern in a plate of an electrically insulating material
5745094, Dec 28 1994 International Business Machines Corporation Electrophoretic display
5750238, Oct 16 1991 Dai Nippon Printing Co., Ltd. Electrostatic information recording medium
5751257, Apr 28 1995 Symbol Technologies, LLC Programmable shelf tag and method for changing and updating shelf tag information
5751268, Dec 15 1995 Xerox Corporation Pseudo-four color twisting ball display
5751433, Jun 27 1997 Xerox Corporation Draft printing system
5751434, Jun 27 1997 Xerox Corporation Area dependent draft printing system
5752152, Feb 08 1996 Eastman Kodak Company Copy restrictive system
5754332, Sep 13 1996 Xerox Corporation Monolayer gyricon display
5759671, Dec 16 1994 Nippon Carbide Kogyo Kabushiki Kaisha Ultraviolet luminescent retroreflective sheeting
5760761, Dec 15 1995 Xerox Corporation Highlight color twisting ball display
5767826, Dec 15 1995 Xerox Corporation Subtractive color twisting ball display
5767978, Jan 21 1997 Xerox Corporation Image segmentation system
5777782, Dec 24 1996 Xerox Corporation Auxiliary optics for a twisting ball display
5783614, Feb 21 1997 AU Optronics Corporation Polymeric-coated dielectric particles and formulation and method for preparing same
5786875, Mar 15 1996 Thermal liquid crystal display using thermoelectric link
5801664, Feb 12 1996 Microsoft Technology Licensing, LLC System and method for transmitting data from a computer to a portable information device using RF emissions from a computer monitor
5808783, Sep 13 1996 Xerox Corporation High reflectance gyricon display
5815306, Dec 24 1996 Xerox Corporation "Eggcrate" substrate for a twisting ball display
5825529, Sep 13 1996 Xerox Corporation Gyricon display with no elastomer substrate
5828432, Mar 09 1995 Leidos, Inc Conducting substrate, liquid crystal device made therefrom and liquid crystalline composition in contact therewith
5835577, Apr 25 1996 AU Optronics Corporation Multi-functional personal telecommunications apparatus
5843259, Aug 29 1996 Xerox Corporation Method for applying an adhesive layer to a substrate surface
5872552, Dec 28 1994 International Business Machines Corporation Electrophoretic display
5874746, Jul 31 1995 Hyundai Electronics America, Inc. TFT, method of making and matrix displays incorporating the TFT
5880705, Jun 07 1995 Transpacific Infinity, LLC Mounting structure for a tessellated electronic display having a multilayer ceramic structure and tessellated electronic display
5892244, Jan 10 1989 Mitsubishi Denki Kabushiki Kaisha; Sumitomo Chemical Company, Limited Field effect transistor including πconjugate polymer and liquid crystal display including the field effect transistor
5892504, Jul 17 1991 U.S. Philips Corporation Matrix display device and its method of operation
5894367, Oct 30 1997 Xerox Corporation Twisting cylinder display using multiple chromatic values
5900858, May 30 1997 Xerox Corporation Rotation mechanism for bichromal balls of a twisting ball display sheet based on contact potential charging
5914698, Apr 15 1996 ADDCO LLC Modular message board
5914806, Feb 11 1998 GLOBALFOUNDRIES Inc Stable electrophoretic particles for displays
5917199, May 15 1998 Innolux Corporation Solid state imager including TFTS with variably doped contact layer system for reducing TFT leakage current and increasing mobility and method of making same
5922268, Oct 30 1997 Xerox Corporation Method of manufacturing a twisting cylinder display using multiple chromatic values
5930026, Oct 25 1996 Massachusetts Institute of Technology Nonemissive displays and piezoelectric power supplies therefor
5958169, Jan 19 1993 Xerox Corporation Reactive ink compositions and systems
5961804, Mar 18 1997 Massachusetts Institute of Technology Microencapsulated electrophoretic display
5963456, Jul 17 1992 Beckman Coulter, Inc Method and apparatus for displaying capillary electrophoresis data
5972493, Aug 10 1994 NONAKA, MR TADASU; CHEMITECH INC Microcapsules for magnetic display and magnetic display sheet comprising such microcapsules
5975680, Feb 05 1998 Eastman Kodak Company Producing a non-emissive display having a plurality of pixels
5978052, Jul 12 1996 Tektronix, Inc Method of operating a plasma addressed liquid crystal display panel to extend useful life of the panel
5982346, Dec 15 1995 Xerox Corporation Fabrication of a twisting ball display having two or more different kinds of balls
5986622, May 24 1996 IROQUOIS MASTER FUND, L P Panel display of multiple display units for multiple signal sources
5989945, May 15 1996 Seiko Epson Corporation Thin film device provided with coating film, liquid crystal panel and electronic device, and method for making the thin film device
6014247, Jun 05 1998 Lear Automotive Dearborn, Inc Electronic ink dimming mirror
6017584, Jul 20 1995 E Ink Corporation Multi-color electrophoretic displays and materials for making the same
6025896, Oct 09 1997 Brother Kogyo Kabushiki Kaisha Display device
6045955, May 28 1997 HEWLETT-PACKARD DEVELOPMENT COMPANY, L P Print method and apparatus for re-writable medium
6051957, Oct 21 1998 DURACELL U S OPERATIONS, INC Battery pack having a state of charge indicator
6055091, Jun 27 1996 Xerox Corporation Twisting-cylinder display
6064091, Dec 10 1997 U.S. Philips Corporation Thin film transistors having an active region composed of intrinsic and amorphous semiconducting layers
6064784, Jun 10 1997 CONCORD HK INTERNATIONAL EDUCATION LIMITED Electrophoretic, dual refraction frustration of total internal reflection in high efficiency variable reflectivity image displays
6067185, Aug 27 1998 E Ink Corporation Process for creating an encapsulated electrophoretic display
6076094, Jul 18 1995 Io Research Pty. Limited Distributed database system and database received therefor
6097531, Nov 25 1998 Xerox Corporation Method of making uniformly magnetized elements for a gyricon display
6105290, May 25 1993 COATES SIGNCO PTY LIMITED Display device
6107117, Dec 20 1996 Bell Semiconductor, LLC Method of making an organic thin film transistor
6113810, May 21 1993 AU Optronics Corporation Methods of preparing electrophoretic dispersions containing two types of particles with different colors and opposite charges
6117294, Jan 19 1996 U S BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT Black matrix material and methods related thereto
6117368, Apr 21 1993 AU Optronics Corporation Black and white electrophoretic particles and method of manufacture
6118426, Jul 20 1995 E Ink Corporation Transducers and indicators having printed displays
6120588, Jul 19 1996 E-Ink Corporation Electronically addressable microencapsulated ink and display thereof
6120839, Jul 20 1995 E Ink Corporation Electro-osmotic displays and materials for making the same
6124851, Jul 20 1995 E-Ink Corporation Electronic book with multiple page displays
6130773, Oct 25 1996 Massachusetts Institute of Technology Nonemissive displays and piezoelectric power supplies therefor
6130774, Apr 27 1999 E Ink Corporation Shutter mode microencapsulated electrophoretic display
6137467, Jan 03 1995 Xerox Corporation Optically sensitive electric paper
6140980, Mar 13 1992 Kopin Corporation Head-mounted display system
6144361, Sep 16 1998 International Business Machines Corporation Transmissive electrophoretic display with vertical electrodes
6146716, Jun 26 1998 SRI International Conservatively printed displays and methods relating to same
6153075, Feb 26 1998 U S BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT Methods using electrophoretically deposited patternable material
6171464, Aug 20 1997 U S BANK NATIONAL ASSOCIATION, AS COLLATERAL AGENT Suspensions and methods for deposition of luminescent materials and articles produced thereby
6172798, Apr 27 1999 E Ink Corporation Shutter mode microencapsulated electrophoretic display
6177921, Aug 27 1998 E Ink Corporation Printable electrode structures for displays
6184856, Sep 16 1998 International Business Machines Corporation Transmissive electrophoretic display with laterally adjacent color cells
6198809, Apr 25 1996 AU Optronics Corporation Multi-functional personal telecommunications apparatus
6215920, Jun 10 1997 CONCORD HK INTERNATIONAL EDUCATION LIMITED Electrophoretic, high index and phase transition control of total internal reflection in high efficiency variable reflectivity image displays
6219160, Jun 06 1997 Thin Film Electronics ASA Optical logic element and methods for respectively its preparation and optical addressing, as well as the use thereof in an optical logic device
6225971, Sep 16 1998 GLOBALFOUNDRIES Inc Reflective electrophoretic display with laterally adjacent color cells using an absorbing panel
6232950, Aug 27 1998 E Ink Corporation Rear electrode structures for displays
6239896, Jun 01 1998 Canon Kabushiki Kaisha Electrophotographic display device and driving method therefor
6249271, Jul 20 1995 E Ink Corporation Retroreflective electrophoretic displays and materials for making the same
6252564, Aug 27 1998 E Ink Corporation Tiled displays
6262706, Jul 20 1995 E Ink Corporation Retroreflective electrophoretic displays and materials for making the same
6262833, Oct 07 1998 E Ink Corporation Capsules for electrophoretic displays and methods for making the same
6266113, Jun 20 1996 BEIJING METIS TECHNOLOGY SERVICE CENTER LLP Reflection type liquid crystal display device
6271823, Sep 16 1998 GLOBALFOUNDRIES Inc Reflective electrophoretic display with laterally adjacent color cells using a reflective panel
6274412, Dec 21 1998 TRUSTEES OF PRINCETON UNIVERSITY, THE Material and method for printing high conductivity electrical conductors and other components on thin film transistor arrays
6287899, Dec 31 1998 SAMSUNG DISPLAY CO , LTD Thin film transistor array panels for a liquid crystal display and a method for manufacturing the same
6300932, Aug 27 1998 E Ink Corporation Electrophoretic displays with luminescent particles and materials for making the same
6310665, Dec 28 1999 Sharp Kabushiki Kaisha Liquid crystal display apparatus and optical addressing device
6312304, Dec 15 1998 E Ink Corporation Assembly of microencapsulated electronic displays
6312971, Aug 31 1999 E Ink Corporation Solvent annealing process for forming a thin semiconductor film with advantageous properties
6323989, Jul 19 1996 E INK CORPORATION A CORP OF DE Electrophoretic displays using nanoparticles
6327072, Apr 06 1999 E Ink Corporation Microcell electrophoretic displays
6340958, Jan 13 1995 PricePoint, Incorporated Solar powered price display system
6348908, Sep 15 1998 Xerox Corporation Ambient energy powered display
6353746, Dec 02 1994 NCR Corporation Apparatus for improving the signal to noise ratio in wireless communication systems through message pooling
6376828, Oct 07 1998 E Ink Corporation Illumination system for nonemissive electronic displays
6377387, Apr 06 1999 E Ink Corporation Methods for producing droplets for use in capsule-based electrophoretic displays
6392785, Aug 28 1997 E Ink Corporation Non-spherical cavity electrophoretic displays and materials for making the same
6413790, Jul 21 1999 E Ink Corporation Preferred methods for producing electrical circuit elements used to control an electronic display
6422687, Jul 19 1996 E Ink Corporation Electronically addressable microencapsulated ink and display thereof
6438882, Jun 11 1990 Lighted flexible display device having a battery supply mount
6445374, Aug 28 1997 E Ink Corporation Rear electrode structures for displays
6459418, Jul 20 1995 E Ink Corporation Displays combining active and non-active inks
6473072, May 12 1998 E Ink Corporation Microencapsulated electrophoretic electrostatically-addressed media for drawing device applications
6480182, Mar 18 1997 Massachusetts Institute of Technology Printable electronic display
6504524, Mar 08 2000 E Ink Corporation Addressing methods for displays having zero time-average field
6506438, Dec 15 1998 E Ink Corporation Method for printing of transistor arrays on plastic substrates
6512354, Jul 08 1998 E Ink Corporation Method and apparatus for sensing the state of an electrophoretic display
6515649, Jul 20 1995 E Ink Corporation Suspended particle displays and materials for making the same
20020021270,
20020090980,
20020130832,
20020140688,
20020145792,
20020154382,
CH563807,
DE19500694,
EP87193,
EP180685,
EP186710,
EP240063,
EP268877,
EP281204,
EP323656,
EP325013,
EP344367,
EP361420,
EP362928,
EP363030,
EP390303,
EP396247,
EP39624781,
EP404545,
EP417362,
EP442123,
EP443571,
EP448853,
EP460747,
EP525852,
EP540281,
EP555982,
EP570995,
EP575475,
EP585000,
EP586373,
EP58654581,
EP595812,
EP600878,
EP601072,
EP601075,
EP604423,
EP618715,
EP622721,
EP684579,
EP685101,
EP708798,
EP709713,
EP717446,
EP721176,
EP778083,
EP889425,
EP899651,
EP924551,
EP930641,
EP962808,
EP1000741,
EP1024540,
EP1089118,
FR2693005,
GB1314906,
GB1465701,
GB2044508,
GB2094044,
GB2255934,
GB2292119,
GB2306229,
GB2324273,
GB2330451,
JP66247,
JP66248,
JP66249,
JP89260,
JP127478,
JP137250,
JP140582,
JP162650,
JP171839,
JP194020,
JP194021,
JP206574,
JP221546,
JP227612,
JP231307,
JP258805,
JP259102,
JP285219,
JP315253,
JP321605,
JP322001,
JP322002,
JP322003,
JP322004,
JP322005,
JP322006,
JP322007,
JP352946,
JP1005040,
JP10142628,
JP10149118,
JP10161161,
JP1020093,
JP1033831,
JP1045412,
JP1048673,
JP1051490,
JP1056653,
JP1086116,
JP1086117,
JP1086118,
JP1088986,
JP11073004,
JP11073083,
JP11084953,
JP11143201,
JP11153929,
JP11161115,
JP11202804,
JP11212499,
JP11219135,
JP11237851,
JP1125613,
JP11264812,
JP11352526,
JP1142537,
JP1177517,
JP1248182,
JP1267525,
JP188986,
JP2000321605,
JP2000322001,
JP2000322002,
JP2000322003,
JP2000322004,
JP2000322005,
JP2000322006,
JP2000322007,
JP2000352946,
JP2223934,
JP2223935,
JP2223936,
JP2284124,
JP2284125,
JP2551783,
JP3053114,
JP3053224,
JP3091722,
JP3096925,
JP3118196,
JP4029291,
JP4060518,
JP4086785,
JP4199638,
JP4212990,
JP4307523,
JP4345133,
JP4355786,
JP5035188,
JP5165064,
JP5173194,
JP5307197,
JP5373098,
JP54152497,
JP55096922,
JP561421,
JP59098227,
JP60189731,
JP60197565,
JP6089081,
JP61074292,
JP6202168,
JP62058222,
JP62200335,
JP62200336,
JP62231930,
JP62269124,
JP62299824,
JP6239896,
JP63006632,
JP6486116,
JP7036020,
JP8006508,
JP8234176,
JP9006508,
JP9016116,
JP9031453,
JP9185087,
JP9211499,
JP9230391,
JP9385609,
JP96277,
WO3291,
WO3349,
WO5704,
WO8689,
WO10048,
WO16189,
WO20921,
WO20922,
WO20923,
WO26761,
WO36465,
WO36560,
WO36649,
WO36666,
WO49593,
WO54101,
WO75720,
WO77570,
WO77571,
WO111424,
WO140856,
WO165309,
WO167170,
WO186346,
WO200747,
WO201281,
WO2057843,
WO2079869,
WO245061,
WO247363,
WO8202961,
WO9008402,
WO9209061,
WO9212453,
WO9217873,
WO9220060,
WO9221733,
WO9302443,
WO9304458,
WO9304459,
WO9305425,
WO9307608,
WO9317414,
WO9318428,
WO9416427,
WO9419789,
WO9424236,
WO9428202,
WO9502636,
WO9505622,
WO9506307,
WO9507527,
WO9510107,
WO9515363,
WO9519227,
WO9522085,
WO9527924,
WO9533085,
WO9613469,
WO9704398,
WO9720274,
WO9724907,
WO9735298,
WO9749125,
WO9803896,
WO9819208,
WO9841898,
WO9841899,
WO9858383,
WO9903087,
WO9903626,
WO9905236,
WO9905237,
WO9905238,
WO9905645,
WO9905646,
WO9910767,
WO9910768,
WO9910769,
WO9912170,
WO9914762,
WO9914763,
WO9920682,
WO9927414,
WO9941728,
WO9941732,
WO9941787,
WO9941788,
WO9947970,
WO9953371,
WO9953373,
WO9956171,
WO9959101,
WO9960554,
WO9965011,
WO9965012,
WO9967678,
///
Executed onAssignorAssigneeConveyanceFrameReelDoc
Oct 11 1999WILCOX, RUSSELL J E Ink CorporationASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0157310418 pdf
Oct 12 1999DRZAIC, PAULE Ink CorporationASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS 0157310418 pdf
Apr 20 2004E Ink Corporation(assignment on the face of the patent)
Date Maintenance Fee Events
Dec 01 2016M1551: Payment of Maintenance Fee, 4th Year, Large Entity.
Feb 08 2021REM: Maintenance Fee Reminder Mailed.
Jul 26 2021EXP: Patent Expired for Failure to Pay Maintenance Fees.


Date Maintenance Schedule
Jun 18 20164 years fee payment window open
Dec 18 20166 months grace period start (w surcharge)
Jun 18 2017patent expiry (for year 4)
Jun 18 20192 years to revive unintentionally abandoned end. (for year 4)
Jun 18 20208 years fee payment window open
Dec 18 20206 months grace period start (w surcharge)
Jun 18 2021patent expiry (for year 8)
Jun 18 20232 years to revive unintentionally abandoned end. (for year 8)
Jun 18 202412 years fee payment window open
Dec 18 20246 months grace period start (w surcharge)
Jun 18 2025patent expiry (for year 12)
Jun 18 20272 years to revive unintentionally abandoned end. (for year 12)